[toofan]

I too use a combo of avast and spybot. These are best acc. to me.

Have you done a boot time scan from both of these. If not then do as follows:

For Avast:
Click on Menu icon(Top left)
Then click shedule boot time scan and then select the required options and click ok.

For Spybot:
Click on Mode menu next to file menu(second from top left)
Click advanced >Settings>settings> and scrol down to Automation > then system start and then select the option run programme once at next system start up.

Then restart.

But it will be better if U use hijack this first. It can be download form net or can be find on digit DVD may be on any freeware issue. Its a small utility.

Use it its safe as you can make a backup before fixing the problem.

And combo fix is the utility which cleans all the unexpected services then it become easy for virus cleaner to detect them and clean.

and one more thing use Host expert before Combo fix.

all these are small utilities and can be downloaded online for free. and there usage are also there.

and feel free to use them they are safe.

If it will be virus problem then it will be done for sure.

If it works do tell and if not post ,it may be ur hard disk/temporary files/registery junk etc also.