How to uninstall when add/remove does not work?

I currently have older versions of solidworks on my computer, 2007 and 2008.  I am trying to uninstall both versions on my terminal to establish a clean install.  We are just getting back into using solidworks again and neither of my versions work so I figured a clean install would fix this.  When I go into add/remove programs the license manager fails to remove both of the programs.  Is there any other way to remove these from my computer?

Thanks

SolidworksAdministration