KB5066835 Install error 0x80074101


Please search for > post a zipped share link

C:\Windows\Logs\CBS\CBS.log
 

My Computer

System One

  • OS
    Windows 10
    Computer type
    Laptop
    Manufacturer/Model
    HP
    CPU
    Intel(R) Core(TM) i7-4800MQ CPU @ 2.70GHz
    Motherboard
    Product : 190A Version : KBC Version 94.56
    Memory
    16 GB Total: Manufacturer : Samsung MemoryType : DDR3 FormFactor : SODIMM Capacity : 8GB Speed : 1600
    Graphics Card(s)
    NVIDIA Quadro K3100M; Intel(R) HD Graphics 4600
    Sound Card
    IDT High Definition Audio CODEC; PNP Device ID HDAUDIO\FUNC_01&VEN_111D&DEV_76E0
    Hard Drives
    Model Hitachi HTS727575A9E364
    Antivirus
    Microsoft Defender
    Other Info
    Mobile Workstation

My Computer

System One

  • OS
    Windows 11 Pro
    Computer type
    PC/Desktop
    Manufacturer/Model
    ASUS z590
    CPU
    Intel Core i7-11700k
    Motherboard
    ASUS z590
    Memory
    16GB Patriot Viper Steel @ DDR4-3200
    Graphics Card(s)
    RTX2070
    Monitor(s) Displays
    Sony XBR65Z9D
    Hard Drives
    1TB Crucial T500 M.2 PCIe Gen4 + many SATA + many USB
    PSU
    AS Rock Steel Legend 850W
    Case
    Silverstone
0x80074101 - Unknown Error

2025-10-19 14:06:05, Info CBS Exec: Processing complete. Session: 31211836_127673607, Package: Package_for_RollupFix~31bf3856ad364e35~amd64~~26100.6899.1.25, Identifier: KB5066835 [HRESULT = 0x80074101 - Unknown Error]
2025-10-19 14:06:05, Error CBS Failed to perform operation. [HRESULT = 0x80074101 - Unknown Error]
 

My Computer

System One

  • OS
    Windows 10
    Computer type
    Laptop
    Manufacturer/Model
    HP
    CPU
    Intel(R) Core(TM) i7-4800MQ CPU @ 2.70GHz
    Motherboard
    Product : 190A Version : KBC Version 94.56
    Memory
    16 GB Total: Manufacturer : Samsung MemoryType : DDR3 FormFactor : SODIMM Capacity : 8GB Speed : 1600
    Graphics Card(s)
    NVIDIA Quadro K3100M; Intel(R) HD Graphics 4600
    Sound Card
    IDT High Definition Audio CODEC; PNP Device ID HDAUDIO\FUNC_01&VEN_111D&DEV_76E0
    Hard Drives
    Model Hitachi HTS727575A9E364
    Antivirus
    Microsoft Defender
    Other Info
    Mobile Workstation
I had this issue. It failed on the Patch Tuesday build, so then I tried the one they released today, same result. I ended up downloading a 25h2 ISO and did an in-place upgrade, which resolved it.

It doesn't really matter that I'm not part of the 'Insider' program, we're all beta testers nowadays. MS has horrible quality control.
 

My Computers

System One System Two

  • OS
    Windows 11 Pro
    Computer type
    PC/Desktop
    Manufacturer/Model
    built myself
    CPU
    Intel Core i7 10700K
    Motherboard
    MSI Z490-A Pro
    Graphics Card(s)
    Intel UHD Graphics 630
    Antivirus
    Microsoft Defender
    Other Info
    TPM 2.0
  • Operating System
    Windows 11 Pro
    Computer type
    PC/Desktop
    Manufacturer/Model
    built myself
    CPU
    Intel Core i7 6800K
    Motherboard
    Asus X99-E
    Graphics card(s)
    NVIDIA GeForce GTX 1050 Ti
    Antivirus
    Microsoft Defender
    Other Info
    no TPM
kjlkjadfasdfasd said:
It doesn't really matter that I'm not part of the 'Insider' program, we're all beta testers nowadays. MS has horrible quality control.
Click to expand...
Well, you'll have a hard time getting an argument about that! :LOL:
 

My Computers

System One System Two

  • OS
    Win 11 Pro 25H2, Build 26200.8655
    Computer type
    PC/Desktop
    Manufacturer/Model
    Home Brew
    CPU
    Intel Core i5 14500
    Motherboard
    Gigabyte B760M G P WIFI
    Memory
    64GB DDR4
    Graphics Card(s)
    GeForce RTX 4060
    Sound Card
    Chipset Realtek
    Monitor(s) Displays
    LG 45" Ultragear, Acer 24" 1080p
    Screen Resolution
    5120x1440, 1920x1080
    Hard Drives
    Crucial P310 2TB 2280 PCIe Gen4 3D NAND NVMe M.2 SSD (O/S)
    Silicon Power 2TB US75 NVMe PCIe Gen4 M.2 2280 SSD (backup)
    Crucial BX500 2TB 3D NAND (2nd backup)
    Seagate 4TB Ironwolf, rotating HDD archive files
    External off-line backup Drives: 2 NVMe 4TB drives in external enclosures
    PSU
    Thermaltake Toughpower GF3 750W
    Case
    LIAN LI LANCOOL 216 E-ATX PC Case
    Cooling
    Lots of fans!
    Keyboard
    Microsoft Comfort Curve 2000
    Mouse
    Logitech G305
    Internet Speed
    Verizon FiOS 1GB
    Browser
    Firefox
    Antivirus
    Malware Bytes & Windows Defender Security
  • Operating System
    Win 11 Pro 25H2, Build 26200.8524
    Computer type
    PC/Desktop
    Manufacturer/Model
    Home Brew
    CPU
    Intel Core i5 14400
    Motherboard
    Gigabyte B760M DS3H AX
    Memory
    32GB DDR5
    Graphics card(s)
    Intel 700 Embedded GPU
    Sound Card
    Realtek Embedded
    Monitor(s) Displays
    27" HP 1080p
    Screen Resolution
    1920x1080
    Hard Drives
    Crucial P310 2TB 2280 PCIe Gen4 eD NAND PCIe SSD
    Samsung EVO 990 2TB NVMe Gen4 SSD
    Samsung 2TB SATA SSD
    PSU
    Thermaltake Smart BM3 650W
    Case
    Okinos Micro ATX Case
    Cooling
    Fans
    Keyboard
    Microsoft Comfort Curve 2000
    Mouse
    Logitech G305
    Internet Speed
    Verizon FiOS 1GB
    Browser
    Firefox
    Antivirus
    Malware Bytes & Windows Defender Security
Noticed there's a new update KB5070773 (26200.6901). So I used the MS "hide updates tool" to hide KB5066835, then successfully updated to 26200.6901
 

My Computer

System One

  • OS
    Windows 11 Pro
    Computer type
    PC/Desktop
    Manufacturer/Model
    ASUS z590
    CPU
    Intel Core i7-11700k
    Motherboard
    ASUS z590
    Memory
    16GB Patriot Viper Steel @ DDR4-3200
    Graphics Card(s)
    RTX2070
    Monitor(s) Displays
    Sony XBR65Z9D
    Hard Drives
    1TB Crucial T500 M.2 PCIe Gen4 + many SATA + many USB
    PSU
    AS Rock Steel Legend 850W
    Case
    Silverstone
Two of the last three updates have failed on my machine. Mine gets hung up on the restart and ends up rolling back. I was able to complete the update with a painful repair by reinstall using UUP Dump. 6901 (yesterday) failed to install but I'm now up and running again. I'm not sure what the issue is...my machine or Microsoft Update.
 

My Computers

System One System Two

  • OS
    Windows 11
    Computer type
    PC/Desktop
    Manufacturer/Model
    Custom
    CPU
    Intel i7-7700K
    Motherboard
    Asus Prime Z-270A
    Memory
    32GB 2666Mhz (Kingston Hyper X Fury)
    Graphics Card(s)
    Asus Nvidia 1050Ti
    Sound Card
    N/A
    Monitor(s) Displays
    Samsung C27F390
    Screen Resolution
    1920 x 1080
    Hard Drives
    1TB Western Digital SN770 (System) and 2TB Western Digital SN770 (Storage)
    Antivirus
    Windows Security
  • Operating System
    Windows 11 Home
    Computer type
    Laptop
    Manufacturer/Model
    Dell/XPS 15 9510
    CPU
    i9-11900H
    Motherboard
    Unknown
    Memory
    32GB
    Graphics card(s)
    Integrated Intel and Nvidia 3050Ti
    Sound Card
    Integrated (Realtek)
    Monitor(s) Displays
    None
    Screen Resolution
    1920 x 1200 (non-Touch)
    Hard Drives
    2TB SK Hynix P41 Platinum
    Antivirus
    Windows Security
You must log in or register to reply here.

Similar threads

Solved KB5077181 (2600 7840) Install Error
Replies
5
Views
1K
pseymour
P
(KB5065426) (26100.6584) Update failed install error 0x800f081f
2 3 4
Replies
63
Views
33K
kevinh
K
2025-08 cumulative update for windows 11 version 24h2 for x64-based systems (kb5063878) (26100.4946) install error - 0x800705b9 - How to FIX??
Replies
2
Views
9K
glasskuter
glasskuter
Solved Windows 11 update Install error - 0xc1900101
3 4 5
Replies
87
Views
20K
zbook
Z
Install error 0x800736b3 with KB5044284
2
Replies
32
Views
19K
RFS
R

Latest Support Threads

Latest Tutorials

Back
Top Bottom