Sounds like you need to uninstall all versions of Java then reinstall the latest version. See
http://www.gnutellaforums.com/333278-post2.html but of course ignore the portion about re-installing LimeWire. Cabos uses the LW core however has a different & more simplistic interface. I haven't tried Cabos in ages since before LW 5 came out. I don't know if the newer Cabos is based on LW 4 or LW 5 code.
BTW you probably should delete your Cabos preferences also.