Problem with iTunes?

Have three devices. I have my iphone, my iTouch, and my laptop. For some reason several of the songs I bought from iTunes can be played on my iPhone and iTouch but they can't be played on my laptop. On my laptop I click on those particular songs and it prompts me to log in in order to validate my device, and then it takes a moment and informs me of the number of devices I have my tunes spread across, and I hit OK. But when I click on the same songs again, I get prompted to login and validate my computer all over again. The problem repeats and I can't get access to these songs. And yet most of the songs I have bought using the same account play for me. I know I'm using the correct email and pass. I checked my email and devices for some semblance of a problem that I could fix to use those songs but there's nothing. What is going on? I can't rebuy the songs because I already own them but they don't play.

Do what Apple want you to do, buy a Mac.

Are these songs really old. Back when iTunes first started, you can only play the songs that you buy on 5 devices. If you don't deactivate it from another device then you can't play it on your 6th device until you deactivate one of the devices.