iTunes cleared my iPod Touch and has asterisks on most of my songs, can't load!

[fineday2fish]

I have about 5 gig of music I transfered to Itunes and loaded on my Ipod about a week ago. I plugged it in and syncd the Ipod and Itunes took almost all of the music off it. Now in my Library most of the songs have an asteric next to them and I can NOT reload them. I am very new to Itunes, so maybe I'm just being a dork. I'd sure appreciate any kind of help I can get.

Thanx

[KAWSquared]

Uninstall and reinstall iTunes. Afterwards, rebuild your iTunes list.