my game has a texture issue i think?

I opened my game recently and I noticed most of my base game items have red and white boxes with question marks and some textures have blue and red boxes with green question marks.  I had uninstalled and reinstalled the game already once and this did not solve the issue, also factory reset and it didn't resolve. I can't play the game as the texture issue makes some parts lag and crash my game. 

I have no clue what it is corrupted on, I had mods and I have removed them from my game as well and that was not the issue it seems. I'm just confused about what to do. 

*i installed the game from steam