to the MW2 haters:
i'm not sure why you guys are letting MW2 influence your decision about black ops. i hated MW2 as well, but black ops is totally different in terms of playability. not only is treyarch the dev NOT IW, but they have...
right click the .exe you're trying to use, go to compatibility, check off where it says run in compatibility with ~ then scroll down to Windows Vista SP 2
try that. also, try running the x32 version also using the same method.