Check Disk will scan thorough your entire hard drive and find errors. It’s probably worth doing every month or two.
Start > Computer. Right click on the drive you want to check and choose Properties.
Select the Tools tab and click the Check now button
Check both options in the dialog box if you want to check the disk thoroughly, if you just want to do a quick check you could just leave the first option selected.
Windows is unable to check a disk while it’s being used, but it will let you schedule a check at the next reboot.
Note: depending on the size of you disk drive and how many files you have a disk check can take a while, sometimes hours.