WEIRD problem

Hey, guys. Well, i just ripped a new CD i bought to my computer through WMP. now, 3 days later, the music is disappearing. It started with the first track on disk one and the 2,3, and 4th tracks on disk 2. a few minutes ago, ALL of the tracks on disk 2 are GONE except for #1, which is still there.
also, to note, i can't get my firewall/av to run either, but i might be able to fix that.
also, to note, i can't get my firewall/av to run either, but i might be able to fix that.