You can try using system restore (Start->Accessories->System Tools->System Restore) and roll back your system to before this problem, but that may or may not be possible.

If you have an anti-virus software package installed (and you should) you can run a full scan and see if that picks up the offending link.

Otherwise, I'd download http://filehippo.com/download_ccleaner/ and run it to get rid of the junk in your system. Then use the registry cleaner section to get rid of whatever is calling that missing .DLL

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