Hi, Any suggestions on tackling this issue? - Dell Dimension 4600 PC, 2 1/2 GB memory, Windows XP SP2. At startup says disk has to be checked for consistency. Then if fails due to 'unexpected error occurred'. If I run chdsk it finds various fragments/errors, but cannot fix them without the /f. If I do chdsk /f it says 'unable to lock drive' - it is in use. Tried in Safe Mode -- same issue. So cannot fix this issue either at startup, or with chkdsk later on. Thanks for help. William.