Hi,
Please follow the methods.
Method 1:
Follow the steps.
a. Click on Start button.
b. Click on Computer.
c. Click on Organize.
d. Click on Folder and search options.
e. Click on View.
f. Select Show hidden files, folder and drive.
g. Remove check mark for Hide extensions for known file type
h. Remove check mark for Hide protected Operating System files (Recommended)
Method 2:
Create new user account and check.
Refer to the link.
http://windows.microsoft.com/en-us/windows7/fix-a-corrupted-user-profile
Method 3:
You may need to reinstall the applications if it was not installed for all users.
Refer to the link.
http://windows.microsoft.com/en-us/windows7/Install-a-program