I had a power outage when was defragmeting with O&O defrag the drive C of my WinXP Pro. After restarting Windows the machine came back just fine. Nothing abnormal at all. But I decided to run chkdsk c: /F just to make sure everything was ok. The machine asked to reboot, made all the checks and Windows was up again. Checking the Event Viewer, the WinLogon event just showed that some indexes were fixed. Great. So I did the whole thing again to make sure that this time chkdsk would not find anything wrong. Well, the same indexes again. And the same result after several tries. I try to boot the PC with another WinXP installed in another disk and check that problematic disk again. The same results. Well, how to fix this? The Windows is apparently working ok, but till when? I'm not very comfortable working with this machine knowing that something is wrong. Thanks for your help.