Why won't Windows Media Player play my MP3s?

I have copied a bunch of music to my new-ish laptop (a work-issued Dell running Vista), but when I try to play some - but not all - of the songs, Windows Media Player pops up a message that says "Windows Media Player cannot play the file. The Player might not support the file type or might not support the... show more I have copied a bunch of music to my new-ish laptop (a work-issued Dell running Vista), but when I try to play some - but not all - of the songs, Windows Media Player pops up a message that says "Windows Media Player cannot play the file. The Player might not support the file type or might not support the codec that was used to compress the file."

However, the files are all MP3s and play perfectly on my other laptop (a work-issued IBM running XP), using Windows Media Player, so I can't imagine that the codec is a problem!

I wanted to make CDs of some of this music to play in my car, but it absolutely refuses to play or burn these songs.

What could the problem be?

Thanks for any suggestions you might have!
Update: Thank you Kuma, darling! I do have - and use - VLC, but I can't use it to burn CDs, so I'm kind of stuck with WMP for this...and there are just so many songs that I have that I want to sing along to while driving! (((Kuma))) Olga, darling, thank you! That did give me more info - and I think that you and... show more Thank you Kuma, darling! I do have - and use - VLC, but I can't use it to burn CDs, so I'm kind of stuck with WMP for this...and there are just so many songs that I have that I want to sing along to while driving!
(((Kuma)))

Olga, darling, thank you! That did give me more info - and I think that you and unny and delsol are right...it must be the codec. Now I just have to find the right one!

(((Olga))) (((delsol))) (((unny)))

Toke Lover, darling, if you know of a better program to use to burn CDs, I'm all ears!! Thank you so much!!!
My beloved also said it might be best to just give up on the CDs and get one of those thingies that I can use to play my iPod in the car, but I'm not really used to the iPod, so I think it would be awkward.

(((Toke Lover)))
Update 2: Oh Purdey, darling, that could very well be true. My Dell seems flimsy and very finicky, compared to my IBM, and the fact that I have to keep Vista - which really is pretty cheesy - on it doesn't make that any better!!

Good to see you, darling - I haven't seen you in a while!!

(((Purdey)))
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