so you should look there its the 3rd tab under preferences to see if it has a source if not then add http://darkstar.ist.utl.pt/slackware...lackware-12.0/
this to your sources list. It should also be the same in the verification tab too.
The next question have you used the command line version and does it work?
again it looks likeof course with the --update flag thrown onto it.Code:#slapt-get
Post back if this works or not.