go to :

goteamspeak.com

and download the client (6megs) :

ftp://ftp.freenet.de/pub/4players/teamspeak.org/releases/ts2_client_rc2_2032.exe

Then run the program - takes a second. Then, plug in your mic into the pink input in the back of yer comp, open up your windows sound controls, go to properties, check off Microphone, unmute it and turn it up, then run teamspeak and set a key that will be your push-to-talk button. do it!