I upgraded to windows 10 and everything else worked perfectly, except IVMP/GTA IV. I tried everything from commandlines to reinstalling the game, nothing worked.
However, only one thing worked, which is adding "-availablevidmem" in a shortcut.. But that only works on GTA IV and does not work on IVMP.
I suppose it's using onboard graphics.. Forcing nvidia does not work either.
Any ideas?