I'm about to pull my hair out!
 
We recently got a new computer.  It's a Gateway and has Vista on it. 

 whatever the heck that means. 
Anyway, I downloaded iTunes...no problem. 
Today, I went to update the iPod.  Program came up that said I needed to update the iPod...did that.  I made some purchases afterwards. 
Here's the problem.  I plug in the iPod and it "syncs".  But the new purchases do not show up.   
What is going on?  I restarted the computer but it still will not recognize my new purchases. 
HELP!!!!!