ipod nano purchases are gone

I purchased games for my ipod nano 4th generation. After synching ipod on new WIndows 7 PC. My Games are gone.

There is no way to even purchase games from itunes store for ipod 4 any more. Just Apps for ipads and iphones.

How do I get back my ipod nano games like Asphalt 4, Tiger Woods Golf, and Pac Man (which totally sucked)