Okay, I just bought the "Game of the year" edition. First, I just installed morrowind itself-played fine. Then I instilled Tribunal and Bloodmoon (in that order). Now, when I try to run the game, I get this "Failed to load snowflake:Meshes/BW_snow_01.nif" message, and can't play the game-I'm running windows vista. Any idea what's going on?

Read this http://www.gamesas.com/index.php?/topic/781497-vistawindows-7-problems/ about Vista problems.

Okay, I think that may have worked, but now I have a new problem-when I start playing, the message- TES3 Stream Waring " model meshes/sky_night_02.nif tex not found "TX_stars_Nebula_02.tg"!
now, after this pops up, and I click cancel, They game plays normal, but will just stop after a few minutes. Any Ideas? Should I just reinstall?

you need to goto my computer... right click MW disc and 'explore' then goto the tribunal and bloodmoon folders and copy everything in the data files folders of each (meshes, textures etc...) to the meshes/texture folder in the data files folder of the Morrowind folder of bethesda softworks under program files in the C: drive.