Follow the methods listed below:
In the mean time, you may do a System File Checker (SFC) scan on your computer. SFC tool scans system files and replaces incorrect versions of the system files by using the correct versions.
To run the System File Checker tool, follow these steps:
1. Click Start, and then type cmd in the Start Search box.
2. Right-click cmd in the Programs list, and then click Run as administrator. If you are prompted for an administrator password or confirmation, type your password or click Continue
3. At the command prompt, the following line, and then press ENTER: sfc /scannow
Check the below link for details: How to use the System File Checker tool to troubleshoot missing or corrupted system files on Windows Vista or on Windows 7
If you have another user account on your computer, log in to the account and try performing the same steps and let us know if the same issue occurs. If it does not, then the first user account may corrupt.
Refer the link below for more details on fixing a corrupt user profile: Fix a corrupted user profile http://windows.microsoft.com/en-US/Windows7/Fix-a-corrupted-user-profile