Please run sfc to see whether the system files are corrupted, and it will fix disk problem automatically:
How to run sfc by administrator on windows 7 /vista:
Go to Start / All Programs / Accessories.
Right click the Command Prompt item and select the ‘Run As Administrator’ option.
Click Continue on the UAC prompt.
In the command prompt window, type the following command.
SFC /SCANNOW
Press ENTER.
(Make sure the command is entered exactly as shown, including the space)
This will take a few minutes to run, try not to use the computer while it is running.
After this is finished, exit any running programs and reboot the computer.
How to run sfc by administrator on windows xp:
press Win+R button on your keyboard
type cmd press enter
type SFC /SCANNOW
Press ENTER.
(Make sure the command is entered exactly as shown, including the space)
This will take a few minutes to run; try not to use the computer while it is running.
After this is finished, exit any running programs and reboot the computer.