You could try downloading and running HJT and posting a log file for viewing.
Important---
Create a permanent folder
EG----
Open MyDocuments----Right click an empty spot and select
NEW---
Folder----Name the new folder
HJT ---this is where you will want to save Hijackthis too, also, backups will be stored there.
Download from here
http://aumha.org/downloads/hijackthis.exe
Do a
SCAN----Scan will change to
SAVE LOG----copy and paste the WHOLE contents of the log
here... Don't try and fix anything yet----It is all important.
Cactus