pro tools requires hardware to run. You either need digi design or maudio hardware to run the software. As far as garageband is concerned, i fyou can find some emulator that emulates the mac os you might be in luck. If you can't I believe you might be stuck because I believe that app is a mac only app (don't quote me on that.)
Alternatives are cubase sx, cool edit, sonar, acid and live. I didn't include reason, because I don't think you can multitrack and record a full band or performance with that.