Deleting Windows.old and Windows10Upgrade folders in a Windows 11 PC.


Bristolian

Bristolian

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Hello,

I'm on the Dev stream for Windows 11. Can I delete the following folders:- Windows.old, and Windows10Upgrade from my C drive?.

Thanks in advance.

Very Best Wishes,
Bob.
 

My Computer My Computer

At a glance

Windows 11Intel(R) Core(TM) i5-8600K CPU @ 3.60GHz 3.60...16GBGeForce GTX 1070
OS
Windows 11
Computer type
PC/Desktop
CPU
Intel(R) Core(TM) i5-8600K CPU @ 3.60GHz 3.60 GHz
Motherboard
ROG MAXIMUS X HERO
Memory
16GB
Graphics Card(s)
GeForce GTX 1070
Hi..
I would use the cleanmgr via the run command.

1637443812223.png
 

My Computer My Computer

At a glance

Windows 11 Home(Beta) - 25H2 -26220.9223AMD Ryzen 5 5600GG.SKILL Ripjaws V Series 64GB 4x16Nvidia geforce gtx titan x
OS
Windows 11 Home(Beta) - 25H2 -26220.9223
Computer type
PC/Desktop
Manufacturer/Model
Banana Junior 5600-G Series
CPU
AMD Ryzen 5 5600G
Motherboard
Asus ROG Strix B550-F
Memory
G.SKILL Ripjaws V Series 64GB 4x16
Graphics Card(s)
Nvidia geforce gtx titan x
Monitor(s) Displays
28" ASUS VP28U 4k
Screen Resolution
4K
Hard Drives
Primary SAMSUNG 970 EVO Plus
PSU
EVGA BQ 700w 80+ Bronze
Case
Zalman i3 NEO
Cooling
ARCTIC Freezer 7 X
Keyboard
Corsair
Mouse
Amazon Generic with Cord
Internet Speed
Download: 295.11 mbps Upload: 65.35 mbps T-Mobile Internet
Browser
Firefox and Edge
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MS - Defender
Other Info
Speakers: Klipsch ProMedia 2.1
Bristolian said:
Can I delete the following folders:- Windows.old, and Windows10Upgrade from my C drive?.
Click to expand...
Yes, if you are sure you won't want to go back to your previous Windows. As BunnyJ says, best to use cleanmgr (aka disk cleanup). It's 'clean up system files' option can clean up previous Windows installs.
 

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.
Thank you :).
 

My Computer My Computer

At a glance

Windows 11Intel(R) Core(TM) i5-8600K CPU @ 3.60GHz 3.60...16GBGeForce GTX 1070
OS
Windows 11
Computer type
PC/Desktop
CPU
Intel(R) Core(TM) i5-8600K CPU @ 3.60GHz 3.60 GHz
Motherboard
ROG MAXIMUS X HERO
Memory
16GB
Graphics Card(s)
GeForce GTX 1070
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