Not reading iTouch library

[bmwestcoast]

I recently bought an iTouch. Loaded it up with songs and hooked it up to the X. No problem. Playlist read and it played songs fine. I connected to another pc and, not knowing enough about iTunes, deleted my songs and it replaced it with a few store-bought tunes. Hooked it up to my car now the screen just reads "reading library" and never changes. Any idea on how to fix this?

Thanks in advance.