I keep getting the blue error screen mainly when I have the dell pc (model OptiPlex 780) running at idle over night or even on the "switch user" screen and every now and then when I'm using the internet. At idle it runs roughly at 38% ram usage (I have 4 gig ram on a windows professional windows). It may just be me but 38% seems kind of high for just being at idle. I've gone thru the dell.com system diagnostics and it claims everything is running fine with no problems. I was wondering if it may be a virus or a ram stick (I have two two gig sticks) going out? When the blue screen pops up and I restart the computer it'll work just fine till I get another blue screen.