i'm pretty sure it's impossible. i have protools and i need a USB dongle key to operate it. if i were you i would get fruityloops. unless you have a mac. then go get a job and pay for protools like everyone else. if you live in canada you can try going to long & mcquade. they sell macs and protools and have really good financing plans.
It was a free version of pro tools, but it has been discontinued. But there are other BETTER options out there.... and yes, they're free.
Whatever you do, avoid cracked versions (read bootleg) of software, in the long run, they usually end up screwin up your PC
Try this:
http://www.reaper.fm/download.php
Let me know if you have any other question about recording, I've been doing it for four years now.