First off my computer (emachine T2642) suddenly quit on me. So since there was no power i replaced the power supply (from emachines website). So computer still wouldn't work so the only other thing that it could be was the motherboard. I replaced it with a compatable motherboard, so now my computer would turn on. But it boots me up to a screen that says windows shut down unexpectedly and there are four options to start up windows. But none of them work, they all lead to a reboot or I get the message /windows/system32/config/system is missing or corrupt. I try to use the restore cd's that contain the windows xp that came with my computer when i bought it. It goes through the whole process of restoring the OS, all 3 CD's and then i reboot to accept the changes. Well it still gives me the error message that i wrote above after running the restore CD's. So i thought that maybe the HD was bad, i go out and but a new Hard drive and replace the old one, try running the system restore cds after the computer prompts me to put in a system disk when i boot up the first time, and i get the same error after running the cd's and reboot. The CD's are spotless, not scratched or anything and i have used the CD's once before shortly after i bought the computer to clean it up. But this is where i am stuck now, where can i go from here. Thanks for any help u can provide.