I'm a little confused as to why my pc will read some tags and my mp3 player won't...

I have a 2gig Esquire mp3 player, music that i copy over to it (All tag information entered) is all ripped from the same disc but only 2 of the tracks display the information properly
i.e with the song supermassive black hole by muse of black holes and revelations will display correctly but another track off the same album will just display "("Y" with the 2 dots above, "P" but with the loop a bit lower and the first letter of each field)"
eg. "asassin - muse - black holes and revelations" will appear as "YPA YPM YPB"

All tracks display all tags in winamp and windows file properties, and if i try to encode the files with Blaze Media Pro, the files which don't display properly on the MP3 player retain all tag fields on the pc but those that work lose all their tag info...

Why is it doing this, how can i sort this out and is there maybe an application i can download to repair and embed all tags for all my music?

(All tracks are mp3 files, tried with more than 1 album - same problem)

Much thanks

I guess you're using the infamous ID3v2.4 format to tag your files. Install MP3tag and convert their metadata to ID3v2.3 ISO 8859-1, which has proven being a highly compatible tagging standard. 2.4 lacks proper support, especially on the hardware side, since it was never adopted as an official industry standard. Even iTunes has its troubles at correctly displaying it.

Thanks Junon, Works beautifully!!!

Oh crap! Ignore last message, all the tags on other albums that don't work are "ID3v2.3 (ID3v1 ID3v2.3)"...
What do i do now oh guru's of all things digital audio-like??!!

No tracks left of 2.4 but still doesn't work

If I understood you correctly, with "other albums that don't work" you mean those you haven't processed with MP3tag so far. Do so with these as well, because I believe their tags are ID3v2.3 UTF-16 ones. The latter stands for unicode, which is unsupported by a good amount of hardware devices. Cut all existing tags outta a whole album using MP3tag and make it insert nothing but ID3v2.3 ISO 8859-1 ones, then test the files on the Esquire player again.

If you are creating or tagging the files in Winamp, go to Preferences->Input->Nullsoft MPEG Audio Decoder and click "Configure". On the Title/Tags tab, change "Write tags as:" to Latin-1 (note: Latin-1 is also known as ISO-8859-1). You'll lose support for creating tags with Unicode characters, but the files will be compatible with your player. This will only effect new files (or any files you edit the tag on subsequent to changing this setting). Use the above-recommended MP3Tag to downgrade your old tags.

Wow! you guys know too much!!!!!!!
Thanks all in order now