Hi I'm having a problem with unmounting, DISM doesn't seem to be recognized at all. I'd really like to remove these dirs. Y:\0\Windows AIK\Tools\PETools>dism.exe /unmount-Wim /MountDir:Z:\y\RT_Mount\ /discard Deployment Image Servicing and Management tool Version: 6.1.7600.16385 Error: 87 The unmount-wim option is unknown. For more information, refer to the help by running DISM.exe /?. The DISM log file can be found at C:\Windows\Logs\DISM\dism.log I currently have two sets of the two RT folders. I use Vista 64 Ult. I apologize for the following bizarre things I may have done to end up with this: Downloaded and installed WAIK to Y:\0\. I use this like "C:\Program Files (x86)". I keep directories intact with something similar done for 64-bit (Y:\0\0\) I may have installed 64-bit RT to Y:\0\ instead, then set temp directory to Z:\y\. I extracted an x86 7 Ult RTM to Y:\RemovedName and started tweaking. While tweaking, I remembered similar deploy tools may delete unrelated files in the work dir, which I assumed was RemovedName. I decided to kill RT and WIM(?) processes in Task Manager. I then tried deleting the files in Z:\y\ but they still seemed to be mounted. I moved the RTM extracted files elsewhere and tried running RT again. It gave me an error telling me to unmount two items. I tried using DISM but I got the above error. Tried uninstalling RT/WAIK with reboots, renaming the Z:\y\ dirs, etc but I still got the same message. I then installed RT to Y:\0\0\ now, and it loaded. I ended up with another two RT dirs in Z:\y\, and copied data to the first set for trial unmounting. I used the Advanced preset and adjusted things to my liking. However I did not use Integration etc, and left them checked anyway. Chose Apply but a .NET error(I assume) appeared later regarding maybe JIT(?) and selected Continue. Stuck at 7%(?) where it errored, I tried exiting. It tried Cleaning but froze so I closed it, and came to post. Thought of using regular dirs, 64-bit RTM etc this time, but didn't want to cause more trouble. I think it may be pretty useful if anything previously used gets auto unmounted if detected at start. Thanks for reading and for your time.