Home Sharing wasn't turned on on my, now broken computer, that won't start. Now I can't syncronise my iTunes on my new computer with my iPod

I had my iPod connected to a computer that's now broken and now it won't start. Now I can't use Home Sharing on my new computer, since it wasn't turned on on my first computer, and I can't syncronise my iPod with my iTunes library. The only thing I can use iTunes for now, is to hear music from my computer... What can I do?

I'm pretty desperate for help; it would be greatly appreciated!

Thank you!