Hi, I don't have a good english, sorry. I have installed Windows xp sp3 pro on a new computer : > Installation of XP SP3 worked fine > Drivers installation : worked fine > Update : worked fine..(but with efforts) > Installation of some software : worked fine I checked : * Hardware : Super pi/Memtest/hdd scan, .. : All worked fine * minidump folder : nothing inside.. My problem : Sometimes, my computer freeze and then the only thing I can do is restart. > When i restart the computer, it says : system32/config/system missing or corrupt > After several restarts, the system still cannot starts.. And I don't know why, but if I change boot order(hdd->cd_drive) the system restarts. And there is no error on windows, or bsod dump.. And if I restore the order to its initial value(cd_driver->hdd), the computer restart with no problem until the Exact same freeze restart. And there is nothing I do before that can lead to the error. I have reinstall XP SP3 and the same problem still exists. Can you help me ? Thank you very much PS : Oh yes, I forgot something. Changing the boot order doesn't solve everytime the problem.. Sometimes, I just insert my CD of win xp sp3(just insert and nothing else) and it works.. And the computer can work for 1-3 days without showing any problems..