Oh yeah solidus before i forget are you trying to click on single player in the new game option?
If so you can' do the followingt load the levels like that you need to bring down the console and type one of these in
map e3/e3_1
map e3/e3_2
map e3/e3_3
U might want to dload my config file and put it in the main dir so the w a s d keys are bound properly
http://homepage.ntlworld.com/gerald.mar ... Config.cfg