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@Bob: Have you made any changes to your computer in the last little while? Try running System Restore just to check what changes you may have made recently. Do not run a System Restore at this point; it's just that because Windows creates restore points automatically whenever changes are made to your computer, we may be able to figure out the cause.
@Bob: Have you made any changes to your computer in the last little while? Try running System Restore just to check what changes you may have made recently. Do not run a System Restore at this point; it's just that because Windows creates restore points automatically whenever changes are made to your computer, we may be able to figure out the cause.
Edit: Also, check out this post by heretican:
http://sc2.nibbits.com/articles/view/32/sc2-launcher-problems-and-possible-fixes