Just for the heck of it
Can you post a hijackthis log
and the make and model of computer
It may or may not show something
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
If hijackthis doesn't show anything, you can just uninstall it and delete the .exe