I got quite a few nasty virus' and trojans on my pc, so after backing up some stuff I decided to do a factory reset to clean it all and start again. I couldnt find a factory reset option, only system restore, so instead I decided to just reformat and install XP over again. This is where the problems start, first of all its a Dell GX270 or maybe a GX270N, not brilliant but good enough for basic stuff. When I put the XP Pro disc in and chose to boot from CD, it would start the install and get to the blue screen, before the user agreement part, and after its finished loading the setup files about to go onto the agreement I get the blue screen of death. So, instead I took the hard drive and put it in my sisters pc and installed XP pro that way, and it all went perfectly, but now when I put it back into the Dell, it comes up with the options, start normally, last recent settings etc. and whatever I press it will just restart itself and do the same over again. I dont know what else to try any help please?