One of our Dell PCs began restarting before login after SP2 was installed. I
formatted the hard drive, made a new partition, installed the operating
system again. I began installing the updates and when I update to SP2 I get
a message about windows\system32\config\system file is corrupt. The computer
will not restart correctly, it has begun restarting on its own again.

This is a Dell Dimension 4400 P4 1.6 GHz; 256M RAM.

No other software has been installed yet.

Thank you.