Boot Camp, Windows XP, and Shallow Pockets

So, I'm broke, I have a MacBook, I have Boot Camp, and I want to play my old Windows games.  Being broke is the important part--I don't want to pay for Windows XP.  So, isohunt to the rescue, I torrented Windows XP Pro, and lo and behold, inside the .rar is... about 42 other .rar files.  Apparently it's split into tons of different parts.  I can't extract any of them--StuffIt Expander runs into a "format error".  How can I get this mess of RARs into a bootable ISO that'll work with Boot Camp?  Thanks.

This'll teach me to go to 4chan for help on anything.  I'm a retard if I don't automatically know how to work with every file format known to the internets.  Now I have 7zX but I have no idea what to do with it--all it seems to do is turn the .rar into a .7z or something like that.