Go to Start > Run and type CMD then when the command prompt window appears, type only: chkdsk c: (change drive letter to where your OS resides if different from c:\) Do you get the following messages? Correcting errors in the Volume Bitmap. Windows found problems with the file system. Run CHKDSK with the /F (fix) option to correct these. I got this on my maxtor 60gb, thinking it was a bad hard drive, despite running a full chkdsk scan with /F and formatting & reinstalling XP, but I still got that message. I swapped over to a working 120gb Western Digital and I'm still getting the same message. If you get the same message when you try chkdsk, then its obviously normal behaviour. (I just want to put my mind at peace )