Have you searched for "album art" problems on the forum and read everything? There are many good suggestions out there.
Your subject could have been worded better to target the assistance required.
You can stop Media Player from updating your data after you are satisfied with the bulk of it. There are utilities that will embed the album data and artwork into the mp3 file (avsoft.nl for one, I think) and then rebuild the Media Player database. Then MC will show everything nicely.