Problem Uninstalling Office 12 Pre-Release

[Spammeh]

Ive loaded up the new word for the first time since I finished uni (month back) and found that the beta has no expired, so I thought i'd download beta 2, and uninstall the original, however when I try to uninstall I get the following popup window:

Catalyst Help
/? - show help
/config <config file> - specify a specific config.xml file
/uninstall <Product ID> - uninstall a product

All I want to do is uninstall this so I can write my CV

Any help regarding a manual uninstall (what registry entries / files need removing) or how to remove totally would be helpful. Thanks