i just perchased the ultamate edition of fallout new vegas from steam and downloaded it, but when i started the game i began seeing giant red triangles with exclamation marks in them everyware, sometimes were enemies should be but the enemy is invisible and the mark takes its place, and everyware i go i get crashes, i literally cant walk 50 steps without crashing and seeing giant red triangles with exclamation marks in them, my first thought was that my mods were doing this but after removing all of them the problem still persists and i dont know whats even happening let alone a clue on how to fix it. please i need help as soon as posible. i am desperate and have no ware else to turn. somone save me from this, please...

The red exclamations indicate missing textures. You removed the mods? Did you disable archive invalidated? Completely removing mods isnt always as simple as unchecking the mod.
I would wipe the new vegas install and start over.

Delete the local content in steam. Then manually delete the new vegas folder. -> typical install location C:\Program Files (x86)\Steam\steamapps\common\fallout new vegas
That previous step is important since steam usually doesnt remove the new vegas directory and that can leave the mods still installed. You want a clean install.

Also remove the save game directory: C:\Users\\Documents\My Games\FalloutNV Backup your saves folder first.

Reinstall the game from steam. Let it install directX and runtimes. Start the launcher and let the game detect video settings.
DO NOT install any mods at this point. Start the game and test it. See if the exclamations are gone and the game is stable.