Update the definitions for your Antivirus program.
Next, please reboot your computer in Safe Mode by doing the following:
- Restart your computer
- After hearing your computer beep once during startup, but before the Windows icon appears, press F8.
- Instead of Windows loading as normal, a menu should appear
- Select the first option, to run Windows in Safe Mode.
Run a full system scan with your AntiVirus and allow it to fix what it detects.
Reboot back into Normal Mode and post a Hijackthis log here.