I have a Compaq Presario 2100 and I'm running Windows XP. I was having a lot of problems with running programs and other such things and I think that I loaded the Service Pack 2. So I did a system restore on my computer and the first time that it tried to restart after the restore it said that it couldn't run windows because Windows/system32/config was either corrupted or missing. And then it didn't give me any choice except to repair. When I went into repair it was over my head. So I redid the system restore because I figured that it didn't work properly. Now after the system restore it will boot the computer and then have a blank screen and then after a few seconds it will shut down and reboot again. Any help that you can give me would be so wonderful. Thank you!