Windows 10 build 9841 (fbl release)

Windows 10 build 9841 is the first officially released and the first publicly available Technical Preview build of Windows 10. This build was demonstrated on 30 September 2014 by Microsoft at a closed press conference. It was later released to users who joined the Windows Insider Program on 1 October 2014. Despite the build number being higher than Windows 10 build 9838 (fbl partner eeap), it was compiled two days earlier in a similar fashion to Windows 7 build 7106 and Windows Vista build 5712.

Windows Media Center
If you add Windows Media Center to this build using a purchased Windows 8.1 product key, the system subsequently identifies itself as running "Windows 8.1 Pro with Media Center", along with a warning that the OS has not been activated.

Window thumbnail border color error
If window auto-colorization is enabled, the window thumbnail borders on the taskbar do not change color even after the wallpaper changes. This issue can be remedied by manually changing the window color through the Control Panel or restarting Windows.

Display drivers error
Like Windows 10 build 9834, this build has a similar display driver issue.

Installing NVIDIA drivers on the x64 version of this build breaks DWM, resulting in a black screen. Older NVIDIA devices and drivers before 2012 are able to function correctly with DWM disabled.


 * AMD drivers do not appear to be affected by this issue.
 * A similar bug has also been discovered when installing Intel HD graphics drivers.