I too hv the AVG, however I run Housecall every so often too, you can find it here:

http://housecall.trendmicro.com/

It seems to pick up the odd thing that AVG may miss...thought u might like to try it.

btw Dont forget to turn off ur current antivirus before running Housecall, and dont forget to turn it back on again when u've finished.