Hi Oggin,
Well at least you can forget about malware being the cause.. The HJT log shows that you are clean. A couple of entries you can fix though..
O4 - HKLM\..\Run: [KernelFaultCheck] %systemroot%\system32\dumprep 0 -k
O4 - Global Startup: PGPtray.lnk = ?
Just housekeeping..
Cheers
Liam