...do you have Ad Aware's Ad-Watch running?? It WILL interfere ! Turn if OFF.
Quite often when I scan my AVG Antispyware, my System resources is fully taxed and the RAM usage goes up to 100%. And when that happens, my system literally slows down to more than snail pace, everything takes ages to access. Only with AVG, no problems with Spyware Terminator or my AVG Antivirus Free. Any idea???