- Look at the disk properties from Windows Explorer
- Go to the Tools tab
- Choose Error Checking
- You will need to reboot to allow CHKDSK to run at startup
- The corrupted directory will either be restored to a readable stateor deleted
Alternatively, the command line approach is CHKDSK C: /B (replace C: with your drive as appropriate)
Once run, you can tidy up as you wish.