Problems with switch and wma converting

so i just recently got my, what seems like, right of passage for college, a good ol' mac book about a month ago.
well i have a fair amount of music, and i've gotten a good portion of it onto my mac, but the problem is i have a few (around 4000) wma's, and i never really used iTunes on my home pc , i got stuck on winamp as a child and used it ever since, for familiarity's sake. and most of the CD's i have are either scratched, lost or weren't mine to begin with.

i've looked around to find something to convert it all, and came across switch, which everyone seems to be in love with. but the problem is the poor program won't work on my mac, either because of snow leopard or... something i'm not sure of. it just "unexpectedly quits" and as i live about an hour and a half from campus and have a fairly busy schedule, going home to convert all this isn't much of an option. (i put everything on to a flash drive and have it on here) so is there any other way i could convert everything (and is anyone else having the problem??) or am i going to have to dedicate a weekend to converting and transferring??