1. Click 'Start,' then type 'cmd' into the 'Search' box. The 'Command Prompt' window will open.
2. Right-click 'cmd.exe' in the results list, then select 'Run as administrator' from the pop-up list. Type your administrator password into the appropriate box if prompted, then click the 'Continue' button. The 'Command Prompt' window will open.

3. Type 'Chkdsk /R X:' at the command prompt, where 'X:' is the drive letter of the volume that needs to be checked. Press the 'Enter' key.
4. Press the 'Y' key when prompted by the system to check the selected drive when the computer is restarted.
5. Close any open applications, then restart the computer. The system will check and repair any I/O errors that it finds.