Fuck man, I've been there before but not with 10,000 songs. If you don't get your music, you have every right to castrate him with a rusty spoon.

I lost a gig of music a couple of years ago, so now I have a 250GB harddrive dedicated to my music and keep Windows on a second hard drive. Works great, Windows can be as unreliable and shitty as it wants to be and your music is safe.