Despite their offer for an uninstaller, it's fake.
Try the Anti-Parasite Suite at http://reviews.cnet.com/5208-6132-0.html?forumID=32&threadID=1313&start=0 and if that doesn't kill it, post a plea in the Security Forum.
Got error message when trying to uninstall Kazaa. It stated Error in C:\windows\system32\cd_clint.dll
Missing entry : servicerundll