I'm not sure if it will help
But let's see a hijackthis log please, see if it will uncover anything
From my signature below, download and save too a permanent folder of it's own onto your harddrive
Hijackthis 1.99.1
Open Hijackthis.exe
Do a "SCAN and Save a Log file"
A log will open in Notepad
Copy and paste the WHOLE contents of the log here... Don't try and fix anything yet----It is all important