Hello,
You did not mention the size of your drive,nor if you had any unused space or not to install Linux.I would be very careful, and would first make a back up image of your windows..Then I would try to see if Windows could resize your drive so that it creates free space for Linux..Unless you are careful and do everything correct you could wind up without Windows..
I personally would suggest for a new comer that you go to Sun and install Virtualbox on windows, then install your virtual box Linux..Another choice would be to install Ubuntu from the wubi installer..This will give you a way to try Linux and not destroying Windows..
Just my suggestion,
Goodluck
jolphil