i have never seen this before and so far cant find any information on this error. this is a company computer we bought from dell (dell precision t3400) it came with xp on it and with a vista disk because we wanted to test vista with our system. well i went ahead with the vista install without doing a system state backup. now we are trying to reinstall xp because of some major incomparability issues with vista and i get this error every time; A problem has been detected and windows has been shut down to prevent damage to your computer. If this is the first time you've seen this stop error screen, restart your computer. If this screen appears again, follow these steps: check for viruses on your computer. remove any newly installed hard drives or hard drive controllers. check your hard drive to make sure it it properly configured and terminated. run CHKDSK /F to check for hard drive corruption, and then restart your computer. Technical information: *** STOP: 0x0000007e (0xf78e2524, 0xc0000034, 0x00000000, 0x00000000) So after getting this the first time i tried uninstalling vista by putting the vista disk back in and following the install process until it asked what drive i wanted to put it on then i formated and restarted hoping vista would be gone but i still got the same message. so now I'm stuck with an empty hard drive and no way to get xp on it. And putting vista back on is not an option.