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I recently upgraded to Windows 10 and like it, but there is a program I urgently need to use which doesn't work with DWM. Because DWM is impossible to disable in Windows 8 and up, I desperately need to get back to Windows 7. I knew I could go back to Win 7 within a 30 day period of upgrading and I am still within that period, but when I try and go back I get this message which says "We're sorry, but you can't go back. The files we need to take you to a previous version of Windows were deleted." I know for a fact I never touched my Windows or Windows.old folders.
I am absolutely desperate to go back to Windows 7. I will do ANYTHING to go back, even if I cannot upgrade to Windows 10 after. I would prefer not to pirate anything, but will use it as an absolute last resort.
This is a Custom PC. I don't have the Windows 7 DVD, but I do have my product key.
1What program? Someone might know a workaround. – David Schwartz – 2015-08-25T05:32:17.800
I've already checked. To be more specific the program is QuArK Army Knife. Technically the software renderer works but the far distance is unbearable then, and OpenGL requires that DWM is disabled to work correctly or I get this strange effect where the back of a cube seems to be going through the front of it. The issue is known but hasn't been fixed. – tomysshadow – 2015-08-25T05:36:57.530