I think this is only happening with Bloodmoon, because I did an uninstall, reinstall, and it stopped happening, but as soon as I reinstalled Bloodmoon, it happened again.

I try to open Morrowind, and I get a message that says "Error: Failed to load snowflake: Meshes\BM_Snow_01.nif"

Not sure how to fix it. As far as mods, I do have a lot of graphics and texture mods installed, BUT, I have gotten this message when I had not a single mod installed either. So I do not believe it to be mod related.

This is a problem caused by Vista and Windows 7.
The easiest way yo correct it is to just http://www.gamesas.com/index.php?/topic/781497-vistawindows-7-problems/page__view__findpost__p__11352753. This will also avoid some problems that can occur with mods.

http://www.gamesas.com/index.php?/topic/781497-vistawindows-7-problems/ should help.

Edit: ninja'd.