I was having 20gb drive and I replaced it with 160gb and installed Windows on it. It worked properly, but I downloaded a bad driver and so wanted to do a system restore. So, when I ran the system restore and went to far, so I reversed the system restore. But at the time of reversing I got an error that said "some file could not be recovered on C:.. or something". So, I tried to restart the computer and it said pci.sys is corrupt or missing and to run the recovery console. When I inserted the Windows setup disk to run recovery console, it started to load files for the setup and then I got a message that said pci.sys is corrupted or missing. Now I am stumped over here and cant do anything. So can anyone tell me how to solve this issue? Thanks.