Cannot Uninstall IE 9

Although I like IE 9 Beta, I need to uninstall it as it does not work with VMWare Virtual Desktop. However, I cannot find it in the list of programs nor installed updates. I tried installing IE 8 on top of it, but get the message that a new version of browser is already installed. And I tried deleting the Internet Explorer folder in the Programs folder but get the message that only TrustedInstaller can delete. I have administrative right on the PC involved. What do I do now?

Thanks!