I already have this kind problem, RT 7 Lite tries to mount WIM file in default TEMP DIR but dir is already have a previuos image on it. To resolve that you need remove\unmount that dir using bat\cmd file with that code: DISM /Unmount-Wim /MountDir:"C:\Users\YourName\AppData\Local\Temp\RT_Mount" /discard DISM /Cleanup-Wim TAKEOWN /F C:\Users\YourName\AppData\Local\Temp\RT_Mount" /R ICACLS C:\Users\YourName\AppData\Local\Temp\RT_Mount" /T /L /GRANT *S-1-1-0:F RD /s /Q "C:\Users\YourName\AppData\Local\Temp\RT_Mount" Where "C:\Users\YourName\AppData\Local\Temp\RT_Mount" is your RT 7 Lite temp folder inside in your User Dir. The above path is defauth RT 7 Lite TEMP DIR, but sometimes it can creates diferent paths. To see the right path, go to DOS Prompt and type: DISM /Get-MountedWimInfo this will show any mounted WIM image in your system and currect path. Other way to remove that dir is using a Unlocker program taht you can download here: http://ccollomb.free.fr/unlocker/ thanx! worked like a charm