I'd start out by going to a bunch of web sites and downloading free trials of their software. Try Sonar, N-tracks, CoolEdit, Vegas, and any others you can think of.
Download the manuals, too, if they have them available. Keep playing with the different ones out there untill you either find one that works for you, or untill you just give up in sheer frustration and run to Guitar Center to buy a hard-disk multitrack recorder.