Malware in rundlll32.exe

For some odd reason, Avast keeps notifying me (for over 40 times now) that they blocked a malware at C:\Windows\SysWOW64\rundll32.exe
The notifications just won’t stop. I did a scan for the entire C:\Windows folder, but avast! said that there’s no threat found. I’m now doing a full-time scan.
The notifications still persist. And I dare not delete that folder as I’m afraid that it’s actually important.

Would really appreciate some assistance!

for help, follow logs guide at top in viruses and worms forum section. http://forum.avast.com/index.php?topic=53253.0