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problems opening a dvd

Question/Problem:
I hope I can explain this sufficiently... I bought a season of a tv show on dvd, and attempted to play it on my laptop, using Windows Media Player. On the root menu screen, I am unable to open any episode but the first one. Essentially, the root menu is frozen. The background music continues to loop, but I can't get the select-highlight thing to move. It's stuck on the first episode- the title is highlighted, and I can click and open it. In the menu for that episode, everything works normally. I can click on any of the options, and open each new window. However, when I return to the root menu, it's still stuck. The mouse doesn't move the select-highlight. When I click on another title, it's not the hand cursor, it's the arrow, and nothing happens. If I double click, all it does is change the screen to full-screen, or vice versa.
I took the disk out, put it back in and tried again. It didn't work. I restarted my computer, put the disk back in and tried again, and that didn't work, either. I tried with another disk in the box-set, but it had the same problem. The first episode was highlighted and would play, but that was it. I downloaded a trial version of a different media player (CyberLink Power DVD 5) and the same thing happened. So, I tried another disk from a different series, with WMP. It works fine. Then I tried the first (problem) disk again, but it still wouldn't work.
I would think that it is a faulty dvd set, except that this has happened to me before. The thing is, I can't remember why, or how (or if) it got fixed. If anyone has any ideas, I would be completely grateful.

Operating System and VERSION: Windows XP
Web Browser and VERSION: I'm gonna say Internet Explorer 7 (I know its Internet Explorer, but I can't find the version. I can't even find "Help" or "About" on my browser, I'm ashamed to say.)
Your level of experience: not even beginner

Duration of problem: just today, although it has happened before

Any steps you've taken to troubleshoot? I've searched on-line, to no avail, and I've attempted to use the "troubleshoot" section of Windows, but that hasn't provided me with anything useful.