I have a windows pc. It has windows 8 installed and I've installed the newest version of itunes but when I try to play anything, it won't. There's no sound and it says it's playing but it does not. What can I do?

I have a windows 8 computer and I installed the newest version of itunes because I used to have an ipod and I have a few purchases that I wanted to listen to. When I try to play them it says it's playing but I can't hear anything. It does not even says it's played the whole way. It just stays at the beginning. It won't let me pause. I checked my computer sound and there is nothing wrong with it. So there must be some software problem but idk what it is. If anyone can help I would appreciated. Thank-you