Found a key and everything broke

[Woolean]

I entered a house through the window, since it was locked, and spend some time there. After that, i found the key of the house in one of the drawers, and when i placed it in my inventory, everything broke and i wasn't able to move anything, i managed to drop some items on the floor, but i couldn't put the new key with the rest of my keys. 

So, trying everything, i dropped the keychain (I don't know it's name, i play it in spanish) on the floor, and a bunch of containers similar to the keychain appeared on the floor, lagging everything to hell. My character got stuck in that position and i wasn't able to move it again. I believe that save file is broken now. 

If i try to move, the character spins in place, and if i open the inventory, i get a massive fps drop and i have to wait some seconds to close the inventory. 

[EnigmaGrey]

Are there any mods installed?