so i finally found a dragon item in OOO and the mesh/texture (whats the appropriate term?) is missing or corrupted. the item is a dark grey and red pixleated mess. i found another dragon item and it is messed up as well.

Also today i finally decided to do some of the main quest and when i behead mythic dawn npcs i get a big yellow "WTF im missing a mesh" icon. (which was funny as hell the first time!). This doesn't appear when i use the DR finishing moves on any other npc

Should i just reinstall these mods or is there another solution?

Which dragon items? Which OOO version? Are you running the game on medium or small textures?

EDIT: Just checked the Pegasus set's (which I presume you mean) textures and they seem to be properly mipmapped, so it shouldn't matter which texture size you're using.