So I downloaded a copy of Ubuntu and before I went to go install it there was an option to run Memtest86 so I thought sure why not. It is version 1.65. So It was running through and by the time it got to test 6 I started seeing lots of errors. like in the hundreds. I am now in test seven and there is over 1100 errors. And I dont think this is a good thing. When I built my machine about a year ago I put 2x1Gb sticks in it (PC3200 400Mhz) and I have never had a problem installing anything. About a week ago I bought another 2x1Gb sticks for my computer again (PC3200 400Mhz) and installed them. It showed up in XP that I only had 3Gb of RAM installed and I went around and did some reading alot of people said they had this problem with XP. So i thought nothing of it. And that when I upgrade to Vista (very soon) I will be able to see all 4Gb being in use. So I downloaded a copy of Ubuntu and I thought I would try it out. So I burnt the image to a disc and thats when I thought I would try the Memtest86 thing. So thats my problem. I am just wondering about all the errors?? I hope someone can help me. ++ Ok, so its been running for an hour now (on test 8) and I have 1153 errors so far?? P.S. I tryed hitting escape to end it and it wont quit the memtest how long is this going to take? and if I just shut my computer off manually (holding down the power button) will this ruin my RAM at all??