This problem is usually solved by the MS SFC tool (system file checker).
Launch sfc /scannow from an elevated command prompt, wait till it finishes and see whether the problem disappears.
If not, reboot your machine and re-check.
Looking forward for your kind feedback!
How to run an elevated command prompt for Windows vista/seven users
One of these three methods:
- click start, all programs, accessories, right-click the command prompt in the list and click run as administrator, click yes on the user account control window that should appear
- click start, type cmd in the searchbox, right-click the cmd in the list of results and click run as administrator, click yes on the user account control window that should appear
- click start, type cmd in the searchbox, press and keep pressed ctrl + shift Keys on your keyboard, then press enter, click yes on the user account control window that should appear
