Itunes won't play on a pc

I have itunes installed on a 64-bit windows 7 laptop. Used to work. Now it doesn't. When you click play on a song, it the icon changes from a triangle to the two rectangles (play to pause), but it doesn't play.  Many songs. They show as mpeg-4 protected files.  Have repaired itunes, upgraded to 11. Removed it. Re-installed it.  Other applications can play.  Itunes will play movies, but not songs.  Any suggestions?
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brendonfeeleyConnect With a Mentor Commented:
I had this problem back with iTunes 10 a while back.

This thread helped me:

More specifically, this:
"you have to goto quicktime, open quicktime preferences and select audio tab and then click the select audio playback and recording devices button."

After playing with those settings and restarting iTunes, problem solved.

Hope that works for you.
David CarrConnect With a Mentor Commented:
you may have exceeded the five computer authorization limit on which to play your music purchases. Once you've authorized five computers (by playing songs you've purchased on them), you won't be able to listen to purchased songs on a sixth computer until you deauthorize one of the first five.
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