Windows trusted installer denying access to files

This was such a pain in the balls, installed an application but when I did the OWNER installed under TRUSTED INSTALLER, needed to gain permission to edit an file - he's how.

Follow the below Steps in Server 2008, Windows 7:

1. Right click on the file or directory.
2. Click on “Properties” on the right click menu.
3. Click on “Security” tab. 

4. Click on “Advanced” button at the bottom. 

5. In Advanced Security Dialog window, click on “Owner” tab. 

6. Here you will be able to see current owner (i.e. Trusted Installer).
7. To take ownership of the object, click on the Edit button.

8. Make sure to remove READ ONLY