obviously when you had computer problems something in your system got screwed up, you need to check your drivers and probably reinstall windows. the fact that you have two games messed up that played before is proof of something wrong in your system and not just with sc2, or the other game alone. sounds like graphics drivers probably got screwed up so start there, and make sure any other drivers are up to date as well and try. if you still have problems i would suggest a full windows reinstall after.
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