Trackpad acting like a mouse click

Hi,
Today my trackpad started acting in a unusual way when I was using BootCamp. It acts like I'm pressing the click key while I move the trackpad. Even using Leopard, when I start moving around the cursor using the track pad, it only highlights everything, and I can't click. I have to use a mouse and check the "ignore trackpad" option. I don't think it's a hardware problem, as the trackpad recognize the right clicking command, the scroll command and the move cursor command. Maybe it's something with the button behind the touch pad. This issue started suddenly when I was playing a game running boot camp. Please, could someone help me solving this problem?
I've read some other forums and some people solved this problem creating a new system account, other had to buy another cap for the trackpad. I would really apreciate a free solution heheheheh.
Thank you.