Did you happen to notice how many processes were running? And, is the mem usage for NTRtScan.exe static or does it change constantly?
Yes, 47 seems like a heck of a lot...
The NTRtScan always has the same static...
Also I might mention, that Internet Explorer (ver. 7) seems to cause my system to slow and if I have more than 2 tabs open, I get the error message too, even if IE is the only application I have going...