I had New Vegas since it came out and it played great, My computer recently had to be crashed and rebooted so, then I bought both DLCs and now I started a new game. Nothing on the keyboard responds except for Esc but it's unplayable. That is, unless I am holding down the L-ALT key and pressing the controls, which still makes the game unplayable because even though I changed the key that brings up the pip-boy I am still pressing TAB which takes me out of the game because it's on steam. Someone Please help!!

My keyboard is perfectly fine, to my knowledge (I'm using it right now). All the graphics are up tp date. did something not connect together? did the game shut of communications to the keyboard?