Did you run any virus scans? If so, were any RTW or EB files removed/quarantined? Try restoring them if possible.
Try downloading and installing the various Microsoft Visual Studio C++ redistributable's as MS likes to call 'em: those are basic C++ standard libraries virtually all Windows C++ software depends on. Perhaps they have been replaced by incompatible/buggy versions.
http://www.google.com/search?hl=en&q...edistributable (Google search)
If all else fails, try installing a defragmenter like JKDefrag: http://www.google.com/search?hl=en&q=JKDefrag (Google search)
Bookmarks