@ ExSp33db1rd- use the "portable" version of Revo. No need to install it or sign up, just extract the downloaded Zip file to a suitable folder (on a memory stick if needed) and click on the "exe" within. I've used this excellent product many times, and it's always done the job.
It has even successfully removed anti-virus programmes, although you need to ignore the (usual) prompt to re-boot given by the programmes own un-installer which Revo runs first.
Code:
http://www.revouninstaller.com/download-free-portable.php
P.S. Oh, and Thunderbird is an email client - I think you mean "Firefox"
