Please open the wininit.ini file, and change the line that says

c:\progra~1\alwils~1\avast4\aswnWCNgIz=c:\progra~1\alwils~1\avast4\asw6180.tmp

to

c:\progra~1\alwils~1\avast4\aswres.dll=c:\progra~1\alwils~1\avast4\asw6180.tmp

Then restart the machine. That should do the trick.

Thanks
Vlk