Because your Antispyware is wrong. Get some proper protection.

Is it by any chance on this list BTW

Rogue Antispyware list Click Me

You are not supose to use add/remove programs to remove Limewire

But if you want Limewire gone that badly, then reinstall it and then go to Start>Programs>Limewire>uninstall or an alternative is to go directly to your Limewire programs folder and double click the uninstaller

Then do a normal windows search for Limewire including hidden files and delete what you find