You don't need to wipe Windows, but you do need some free partitions on your hard disk.
Your best bet is probably Mandrake 8.1, you can download it from http://www.mandrake.org/
but be warned - it is one and a half GIG for a full download! You might be better off heading over to http://www.cheepbytes.com/
(I think that's the URL) and getting a cheep copy.