To Prevent Applications From Running On Windows 7

Open up the group Policy Editor.



Go user user configuration -> Administrative Template -> System folder then double click don't run specified Windows Applications




Now click enabled on Disabled on Enabled.
If you click Enabled you can select application that you want to disable.

Also under registry editor you can check the settings on the applications.
Type regedit under run.
Then under the disallowrun registry key you can check to see if any application has be disabled.

How to Change the Windows Installer Setting ?

1) First open the group policy editor.




In the GP editor, you select Computer Configuration-> Administrative Templates -> Windows Components -> Windows installer.
Then Double click the Windows Disable Windows Installer



Windows Installer has 3 settings Always, Never & For-non managed apps only.

Always will disable any application installs.
Never will allow any application installs.
For-non managed apps only will only enabled managed applications only.