I have managed to clean one 8.1 system having found the possible miscreant in an unexpected area

This fix will generate a log for those areas

CAUTION : This fix is only valid for this specific machine, using it on another may break your computer

Open notepad and copy/paste the text in the quotebox below into it:

CMD: DEL %TEMP%\*.* /F /S /Q CMD: RD /S /Q %TEMP% Folder: c:\Documents and Settings\Edo\Local Settings\Temp Folder: c:\WINDOWS\Prefetch REBOOT:

Save this as fixlist.txt, in the same location as FRST.exe
Run FRST and press Fix
On completion a log will be generated please post that