I'd bet that the blue screens are related to that RAM more than anything else..test it in another board if you can. It certainly could be a bad part on the mobo as well, so I'd try known good ram in ...

I bought a DDR RAM stick which I use as the only one in my home machine.<BR><BR>Once a week (just to say something) I get a BSOD when loading WinXP. <BR><BR>To test ...