ET problem

OK I finally built my new PC after 3 hours of hard work and 5 cut fingers.

Everything is working, sound, graphics, CPU everything.

When I got to play ET it freezez however at awaiting challenge 1.

The original ET DOES work, its just when I upgrade to 2.60 and 2.60b that it freezes.

ANy help would be appreciated.

EDIT : thought it was fixed it wasn't. It just seems to be ET 2.60 that I have the problem with.

ET original works.
ET 2.60b on its own works but I get the pk3 file missing when connecting to server.

When I install 2.60 it freezes at awaiting challenge 1.

:/