Cannot preview songs, listen to radio or connect to App store. Did all before.

I just wanted to know if you would have some sort of solution since I cannot connect to App Store for a couple weeks now, cannot preview songs, cannot download purchased songs and cannot listen to the radio on iTunes, however I can listen to internet radio and play my previous downloaded music. I am running Mac OSX 10.8.5 and have the latest version of iTunes, 10.2.2.25. It worked a few weeks ago and now nothing.

Any suggestion will help.

Thank You

sofrombethelpark