Are your Windows 7 themes greyed out? Your system administrator might prevent changing themes via a group policy and therefore your Windows 7 themes are greyed out. If you are the system administrator, you still might want to check out this group policy.

Windows 7 Themes Greyed Out

1. Step Click on “Start” and enter gpedit.msc into the search field and click on the item that appears
2. Step Uncollapse User Configuration\Administrative Templates\Control Panel\Personalization\

Windows 7   Policy Personalization

3. Step In the right pane, double-click on “Prevent changing theme”and if “Enabled” is check, uncheck it:

Prevent Changing Windows 7 Theme

4. Step Your Windows 7 themes should now no longer be greyed out!

Are your Windows 7 Aero themes greyed out?

If your Windows 7 Aero Themes are greyed out only and all other themes are working, you should read the tutorial: Windows 7 Aero themes greyed out

Windows 7 theme stuck on “Classic”?

If your theme is stuck on classic, read this: Windows 7 Theme Stuck on Classic