Update DesktopExperience of package DesktopExperience failed to be turned on. Status: 0x80070005.

I need to add desktop experience to my windows 2008 standard r2 terminal server. I have tried to install about 15 times. Everytime on reboot it rolls back the changes. I have tried disableing all non essentials services and start up items and uninstalling anti virus with no luck.

Any help would be much appreciated.

thanks