Solved Remove Previous Windows installation(s)?


jvickers

jvickers

The lunatics have taken over the asylum
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Now that I'm pretty much wed to and ensconced in Windows 11, do you think it's safe to delete the previous windows installations? Those file are eating up 26GB of my 512GB SSD, which only has around 100GB free at the moment?
 
Windows Build/Version
Windows 11

My Computers My Computers

System One System Two Other systems

  • At a glance

    Windows 11 Pro 25H2 RP channelRyzen 9 5900XCorsair Vengeance RGB PRO 64GB (2x32GB) DDR4 ...ASUS GeForce RTX 4070 Super OC 12GB DDR6 / ZO...
    OS
    Windows 11 Pro 25H2 RP channel
    Computer type
    PC/Desktop
    Manufacturer/Model
    Home built
    CPU
    Ryzen 9 5900X
    Motherboard
    MSI MPG X570S Edge Max WiFi
    Memory
    Corsair Vengeance RGB PRO 64GB (2x32GB) DDR4 3600 (PC4-28800) C18
    Graphics Card(s)
    ASUS GeForce RTX 4070 Super OC 12GB DDR6 / ZOTAC RTX 3060 Twin Edge OC 12GB GDDR6
    Sound Card
    Proprietary on MB / FiiO K5Pro DAC
    Monitor(s) Displays
    ViewSonic XG2530 25"/Benq XL2411P 24"/ ASUS VA24DQSB) 23.8"
    Screen Resolution
    1920x1080 240Hz/144Hz/60Hz (based on monitor setup above)
    Hard Drives
    SK hynix Gold P31 1TB PCIe NVMe Gen3 M.2 2280 Internal SSD
    ADATA XPG SX8200 Pro 1TB
    Samsung SSD 860 EVO 1TB 2.5 Inch SATA III Internal SSD
    PSU
    Corsair RM1000e
    Case
    Phanteks Enthoo Pro Full Tower Chassis with Window
    Cooling
    Corsair iCUE H60i RGB PRO XT Liquid CPU Cooler
    Keyboard
    Corsair K70
    Mouse
    Logitech MX Master 3
    Internet Speed
    ~950Mb/s download / ~700Mb/s upload
    Browser
    Edge (Chromium)
    Antivirus
    Norton 360

  • At a glance

    Windows 11 ProRyzen 7 3700X32MB DDR4I forget, but it's old. I can't see the need ...
    Operating System
    Windows 11 Pro
    Computer type
    PC/Desktop
    Manufacturer/Model
    Home Built
    CPU
    Ryzen 7 3700X
    Motherboard
    MSI B550 Gaming GEN3 Gaming Motherboard
    Memory
    32MB DDR4
    Graphics card(s)
    I forget, but it's old. I can't see the need to upgrade it.
    Sound Card
    Propietary
    Monitor(s) Displays
    ACER LED 24" (dual monitor setup)
    Screen Resolution
    1920X1080
    Hard Drives
    1TB Samsung SSD 3.5"
    Case
    Corsair
    Cooling
    Stock
    Keyboard
    Logitech
    Mouse
    Logitech
    Internet Speed
    ~750Mb/s download / ~750Mb/s upload
    Browser
    Edge
    Antivirus
    Defender and Malware Bytes
  • ASUS Vivobook 16X, 16" WUXGA(1920x1200) Business Laptop Computer, AMD Ryzen 7, 16GB DDR4 RAM, 1TB SSD, Windows 11 Pro, Wi-Fi 6, USB-C, Full-Sized Keyboard, Webcam, HDMI
jvickers said:
Now that I'm pretty much wed to and ensconced in Windows 11, do you think it's safe to delete the previous windows installations? Those file are eating up 26GB of my 512GB SSD, which only has around 100GB free at the moment?
Click to expand...

See this thread from earlier today. I believe the official way is disk cleanup which is in Windows Tools.

I am finding it IMPOSSIBLE to delete Windows.old

In Safe Mode it still tells me the directory is not empty, I can't delete the files in the folder either.
www.elevenforum.com www.elevenforum.com
 

My Computers My Computers

System One System Two

  • At a glance

    Windows 11 Home 26H2 RPIntel I3-1010016 GBNvidia GT 1030
    OS
    Windows 11 Home 26H2 RP
    Computer type
    PC/Desktop
    Manufacturer/Model
    Self-build
    CPU
    Intel I3-10100
    Motherboard
    MSI H410M-PRO
    Memory
    16 GB
    Graphics Card(s)
    Nvidia GT 1030
    Sound Card
    Motherboard default
    Monitor(s) Displays
    Philips 27 inch
    Screen Resolution
    1920x1080
    Hard Drives
    Samsung EVO 970 NVMe SSD 256 Gb
    Samsung QVO 870 SATA SSD 2 Tb
    PSU
    ATX 450W
    Keyboard
    Logitech
    Mouse
    Logitech Wireless
    Internet Speed
    930 Mb down / 120 Mb up
    Browser
    Edge
    Antivirus
    Windows Defender
    Other Info
    Microsoft Office 2021 Plus

  • At a glance

    Windows 11 HomeIntel i3-810016 GbNvidia GT 720
    Operating System
    Windows 11 Home
    Computer type
    PC/Desktop
    Manufacturer/Model
    Self-build
    CPU
    Intel i3-8100
    Motherboard
    Gigabyte Z370 D3
    Memory
    16 Gb
    Graphics card(s)
    Nvidia GT 720
    Sound Card
    Motherboard default
    Monitor(s) Displays
    Philips 27-inch
    Screen Resolution
    1920x1080
    Hard Drives
    Samsung 960 NVMe SSD 256 Gb
    Seagate 2 Tb HDD
    PSU
    ATX 450W
    Keyboard
    Microsoft
    Mouse
    Logitech Wireless
    Internet Speed
    930 Mb down / 120 Mb up
    Browser
    Edge
    Antivirus
    Windows Defender
jvickers said:
Now that I'm pretty much wed to and ensconced in Windows 11, do you think it's safe to delete the previous windows installations? Those file are eating up 26GB of my 512GB SSD, which only has around 100GB free at the moment?
Click to expand...
I always ditch them straight away as part of a post update clean-up. Macrium back up always done just prior to an update so there's no point to keep it
 

My Computer My Computer

At a glance

Windows 11 Pro Beta, 11 Dev, W11 CanaryAMD Ryzen™ 9 5900HX32GBNVIDIA® GeForce RTX™ 3070 8GB GDDR6
OS
Windows 11 Pro Beta, 11 Dev, W11 Canary
Computer type
Laptop
Manufacturer/Model
Dell Alienware M15 Ryzen Edition R6
CPU
AMD Ryzen™ 9 5900HX
Memory
32GB
Graphics Card(s)
NVIDIA® GeForce RTX™ 3070 8GB GDDR6
Hard Drives
1 x Samsung 980 Pro 1TB
1 x Samsung 970 Evo Plus 1TB
jvickers said:
Now that I'm pretty much wed to and ensconced in Windows 11, do you think it's safe to delete the previous windows installations? Those file are eating up 26GB of my 512GB SSD, which only has around 100GB free at the moment?
Click to expand...
As long as you have an image to go back to then yes.
 

My Computers My Computers

System One System Two

  • At a glance

    Win 11 ProAMD Ryzen™ 7 7730U24GB Dual-Channel DDR4 @ 1596MHz (22-22-22-52)512MB ATI AMD Radeon Graphics (ASUStek Comput...
    OS
    Win 11 Pro
    Computer type
    Laptop
    Manufacturer/Model
    ASUS Vivobook
    CPU
    AMD Ryzen™ 7 7730U
    Motherboard
    M1605YA
    Memory
    24GB Dual-Channel DDR4 @ 1596MHz (22-22-22-52)
    Graphics Card(s)
    512MB ATI AMD Radeon Graphics (ASUStek Computer Inc)
    Monitor(s) Displays
    Generic PnP Monitor (1920x1200@60Hz) - P1 PLUS (1920x1080@59Hz)
    Screen Resolution
    1920 X 1200
    Hard Drives
    953GB Western Digital WD
    PSU
    45 Watts
    Mouse
    Lenovo Bluetooth.
    Internet Speed
    500 Mbps
    Browser
    Edge
    Antivirus
    Defender

  • At a glance

    Windows 11AMD Ryzen 7 5800H / 3.2 GHz32 GB DDR4 SDRAM 3200 MHzNVIDIA GeForce RTX 3060 6 GB GDDR6 SDRAM
    Operating System
    Windows 11
    Computer type
    Laptop
    Manufacturer/Model
    ACER NITRO
    CPU
    AMD Ryzen 7 5800H / 3.2 GHz
    Motherboard
    CZ Scala_CAS (FP6)
    Memory
    32 GB DDR4 SDRAM 3200 MHz
    Graphics card(s)
    NVIDIA GeForce RTX 3060 6 GB GDDR6 SDRAM
    Sound Card
    Realtek Audio. NVIDIA High Definition Audio
    Monitor(s) Displays
    15.6" LED backlight 1920 x 1080 (Full HD) 144 Hz
    Screen Resolution
    1920 x 1080 (Full HD)
    Hard Drives
    Samsung 970 Evo Plus 2TB NVMe M.2
    PSU
    180 Watt, 19.5 V
    Mouse
    Lenovo Bluetooth
    Internet Speed
    500 Mbps
    Browser
    Edge
    Antivirus
    Defender
I have an image, so there's no worries there.
 

My Computers My Computers

System One System Two Other systems

  • At a glance

    Windows 11 Pro 25H2 RP channelRyzen 9 5900XCorsair Vengeance RGB PRO 64GB (2x32GB) DDR4 ...ASUS GeForce RTX 4070 Super OC 12GB DDR6 / ZO...
    OS
    Windows 11 Pro 25H2 RP channel
    Computer type
    PC/Desktop
    Manufacturer/Model
    Home built
    CPU
    Ryzen 9 5900X
    Motherboard
    MSI MPG X570S Edge Max WiFi
    Memory
    Corsair Vengeance RGB PRO 64GB (2x32GB) DDR4 3600 (PC4-28800) C18
    Graphics Card(s)
    ASUS GeForce RTX 4070 Super OC 12GB DDR6 / ZOTAC RTX 3060 Twin Edge OC 12GB GDDR6
    Sound Card
    Proprietary on MB / FiiO K5Pro DAC
    Monitor(s) Displays
    ViewSonic XG2530 25"/Benq XL2411P 24"/ ASUS VA24DQSB) 23.8"
    Screen Resolution
    1920x1080 240Hz/144Hz/60Hz (based on monitor setup above)
    Hard Drives
    SK hynix Gold P31 1TB PCIe NVMe Gen3 M.2 2280 Internal SSD
    ADATA XPG SX8200 Pro 1TB
    Samsung SSD 860 EVO 1TB 2.5 Inch SATA III Internal SSD
    PSU
    Corsair RM1000e
    Case
    Phanteks Enthoo Pro Full Tower Chassis with Window
    Cooling
    Corsair iCUE H60i RGB PRO XT Liquid CPU Cooler
    Keyboard
    Corsair K70
    Mouse
    Logitech MX Master 3
    Internet Speed
    ~950Mb/s download / ~700Mb/s upload
    Browser
    Edge (Chromium)
    Antivirus
    Norton 360

  • At a glance

    Windows 11 ProRyzen 7 3700X32MB DDR4I forget, but it's old. I can't see the need ...
    Operating System
    Windows 11 Pro
    Computer type
    PC/Desktop
    Manufacturer/Model
    Home Built
    CPU
    Ryzen 7 3700X
    Motherboard
    MSI B550 Gaming GEN3 Gaming Motherboard
    Memory
    32MB DDR4
    Graphics card(s)
    I forget, but it's old. I can't see the need to upgrade it.
    Sound Card
    Propietary
    Monitor(s) Displays
    ACER LED 24" (dual monitor setup)
    Screen Resolution
    1920X1080
    Hard Drives
    1TB Samsung SSD 3.5"
    Case
    Corsair
    Cooling
    Stock
    Keyboard
    Logitech
    Mouse
    Logitech
    Internet Speed
    ~750Mb/s download / ~750Mb/s upload
    Browser
    Edge
    Antivirus
    Defender and Malware Bytes
  • ASUS Vivobook 16X, 16" WUXGA(1920x1200) Business Laptop Computer, AMD Ryzen 7, 16GB DDR4 RAM, 1TB SSD, Windows 11 Pro, Wi-Fi 6, USB-C, Full-Sized Keyboard, Webcam, HDMI
jvickers said:
do you think it's safe to delete the previous windows installations?
Click to expand...
First thing I do after any upgrade is use Disk Clean up to clean up system files and delete previous Windows installations. There are a few other things besides Windows.old, clean up removes them all.

Of course, the first thing I do before any upgrade is make a Macrium system image, so 'going back' is easy anyway ;)
 

My Computers My Computers

System One System Two Other systems

  • At a glance

    Windows 11 HomeAMD Athlon Silver 3050U8GBRadeon Graphics
    OS
    Windows 11 Home
    Computer type
    Laptop
    Manufacturer/Model
    Acer Aspire 3 A315-23-R9VY
    CPU
    AMD Athlon Silver 3050U
    Memory
    8GB
    Graphics Card(s)
    Radeon Graphics
    Monitor(s) Displays
    laptop screen
    Screen Resolution
    1366x768 native resolution, up to 2560x1440 with Radeon Virtual Super Resolution
    Hard Drives
    1TB Samsung EVO 870 SSD (from April 2026: 250GB EVO 850)
    Internet Speed
    150 Mbps
    Browser
    Edge, Firefox
    Antivirus
    Defender
    Other Info
    UPDATE - 11 April 2026: due to lid hinges starting to break up this laptop has been retired from active duty. The OS with all software and files has been migrated to my System Seven in 'Other systems' to carry on as my general purpose 'main machine'.

    I've now clean installed 25H2 and used Garlin's scripts to update Secure Boot to CA 2023 and revoke the PCA 2011 certificates. It's new role is to test secure boot issues.

    Info for 2021-2026:
    fully 'Windows 11 ready' laptop. Windows 10 C: partition migrated from my old unsupported 'main machine' then upgraded to 11. A test migration ran Insider builds for 2 months. When 11 was released on 5th October 2021 it was re-imaged back to 10 and was offered the upgrade in Windows Update on 20th October. Windows Update offered the 22H2 Feature Update on 20th September 2022. It got the 23H2 Feature Update on 4th November 2023 through Windows Update, 24H2 on 3rd October 2024 through Windows Update by setting the Target Release Version for 24H2, and 25H2 on 30th September 2025 through Windows Update by setting the Target Release Version for 25H2.

  • At a glance

    Windows 11 ProIntel® Core™ i5-520M8GB(integrated graphics) Intel HD Graphics
    Operating System
    Windows 11 Pro
    Computer type
    Laptop
    Manufacturer/Model
    Dell Latitude E4310
    CPU
    Intel® Core™ i5-520M
    Motherboard
    0T6M8G
    Memory
    8GB
    Graphics card(s)
    (integrated graphics) Intel HD Graphics
    Screen Resolution
    1366x768
    Hard Drives
    500GB Crucial MX500 SSD
    Browser
    Firefox, Edge
    Antivirus
    Defender
    Other Info
    unsupported machine: Legacy bios, MBR, TPM 1.2, upgraded from W10 to W11 using W10/W11 hybrid install media workaround.

    In-place upgrade to 22H2 using ISO and a workaround.
    Feature Update to 23H2 by manually installing the Enablement Package.
    In-place upgrade to 24H2 using hybrid 23H2/24H2 install media.
    Upgraded to 25H2 by Enablement Package.

    Also running Insider Experimental 263xx and 29xxx builds and Windows 10 as native boot .vhdx.
  • My SYSTEM THREE is a Dell Latitude 5410, i7-10610U, 32GB RAM, 512GB NVMe ssd, supported device running Windows 11 Pro.

    My SYSTEM FOUR was a 2-in-1 convertible Lenovo Yoga 11e (1st gen) type 20DA, Celeron N2930, 8GB RAM, 256GB ssd. Unsupported device. This has now been sold. It has been replaced by my System Eight.

    My SYSTEM FIVE is a Dell Latitude 3190 2-in-1, Pentium Silver N5030, 8GB RAM, 1TB NVMe ssd, supported device running Windows 11 Pro, plus Insider Beta, Experimental 263xx and 29xxx builds (and a few others) as a native boot .vhdx.

    My SYSTEM SIX is a Dell Latitude 5550, Core Ultra 7 165H, 64GB RAM, 1TB NVMe SSD, supported device, Windows 11 Pro, Hyper-V host machine. Updated to 25H2 on 30th September 2025.

    My SYSTEM SEVEN is a Lenovo Thinkpad T580, 1920x1080 touchscreen, Intel Core i7-8650U, 16GB RAM, 512GB NVMe SSD + 2nd 512GB NVMe SSD, a supported device for Windows 11. This is my current general purpose 'main machine'. The installed Windows 11 Home from my System One has been migrated to this machine. As its new home has an existing digital licence for Pro I've been able to upgrade the migrated OS from Home to Pro.

    My SYSTEM EIGHT is a 2-in-1 convertible Lenovo Yoga 11e (5th gen) type 20LN, Celeron N4120, 8GB RAM, 512GB NVMe ssd, a supported device for Windows 11. Currently running Windows 11 Pro, plus Insider Beta, Experimental 263xx and 29xxx builds as native boot vhdx.
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