Yea, most good virus scanners use a lot of resources because it deep scans your computer. And I have an old Dell (one of my computers) with on 256 RAM and while the scan is going the computer is still fast. Honestly, I think Nortons uses up less resources than the new AIM lol.
OK, my friends, I am a newbee here. So don't get yourself workup if I happen to upset by accident. The first thing you need to do is go to Google and find the program called "RemoveIT Pro ST2", installed, and update it. After that, disconnect yourself from any network, and logon to safemode, disable your user AV, and run a full scan with RemoveIT Pro. You should be able to clean most of it. Remember, what you have gotten here is "ROOTKIT"! It's hidden, and too many of the damn retail AV can't do squad about this. However, I do know that they are beta testing. Thus if RemoveIT can't do it, then try the beta tests.
O how wonderful i think Norton is only downside is that it hogs alot of memory just trying to scan. Especially when its running and i go AFK for 30 mins and the screen saver is on.. O man talk about laggy for a couple of minutes.