I am not super familiar with computer stuff but I did build my machine (about a year and a half ago). I have not added or changed any hardware or software recently. I am running XP 64 bit (was running I should say). I have had Windows updates available for a long time (months at least) that never seem to install even when I restart, or try and force the machine to install them (I think I was still running SP 2). Stop Error message is typical BSOD the code at the bottom in its entirety is: STOP 0X0000007E (0XC0000005, 0XBAA48750, OXBACC342C, 0XBACC3128) That's it, no driver info or anything. I have snooped around this and other sites to try and find a solution to no avail. I downloaded the ultimate boot cd per a suggestion on this or another site, but don't really know what to do with it. I cannot start in safe mode or in last known good configuration. I have run chkdsk /r and performed memory test and CPU test from UBCD but didn't get any errors there either. I am beginning to think that either I have a virus or the OS is somehow corrupt. If I buy Windows 7 can I upgrade and install over XP without losing my other data on my HD? ANY help will be GREATLY appreciated!!!