CoolioWolfus: To quote from the youtube link, from the link from the post above...
Go to your installation directory (..\The Witcher\System\) in there you have the file Witcher.exe, right click and create a shortcut.
Put the short cut on your desktop.
Right click on the shortcut, go to properties, Change the target to have the switch like this
Before switch :
"..\The Witcher\System\witcher.exe" -dontForceMinReqs
That's the fix that's in this sticky thread... I intended to link to the first post of that other thread, which has a different potential solution: http://www.gog.com/forum/the_witcher/fix_minimum_requirements_not_met_on_win7_x64/post1
The problem is that by using -dontForceMinReqs, the game will only have limited graphics options, and can't go up to full detail. The fix in the above link, however, might work while still retaining graphics options. But I haven't tested it myself.