Is the account you use to log on to windows an administrator account? If not, make sure you log in via an administrator account.
You may create a new user account with administrative privilege and check if the issue persists.
Create a user account
If you don’t have any issue in the new User Account, access the link below and follow the steps to fix a corrupted user profile:
This is just a shot in the dark, but worth checking perhaps.
Is your install of Win7 64 bit? If so any 32 bit applications install to Program Files (x86), a hidden system folder.
In my Programs and Features ( from Control Panel ) I have 'Show Hidden Files and Folders' enabled.
To do this:
Click on Organize at top left. Then click 'Folder and search options', then click the View tab, then check Show hidden files and folders.
Start the computer in safe mode and see if the same problem exists