First hit CTRL+ALT+DEL and have a look at your task manager and processes. If you see avserve.exe end it straight away!
Then go into your regedit, (go to Start and then run and type in regedit)
Click on: HKEY_LOCAL_MACHINE then SOFTWARE then MICROSOFT then WINDOWS then RUN
If you see avserve.exe listed there with your other programs then delete it....(Back up your registry first just in case!)