Hey all... it figures

I made a post about how everything runs great in the game; but after my last play a HUGE problem arose outta nowhere. I saved the game (currently on lvl 13).
Now, whenever i load ANY saved game its like i have "Ghost mode" or fly mode on or something. I can walk straight up in the air, through doors, and through anything. It's as if the collision in the game disappeared or something from the last save i did. Nothing seems to works to fix it. Please help!
*After this issue arose i looked up the cheats and enabled the console. I turned fly mode on (it was off) and nothing happened. Same problem. Then when i turn it off i fall through every floor to my death. So. Right now i cannot play at all until this issue gets resolved. I wouldnt mind reinstalling the game to see if it fixes the issue; but i cannot find the saved games anywhere so i dont want to do that cause im afraid i would lose all my progress; and i really dont want to start over. Prior to this issue i did not enable the console or try any cheats, and did not mess with any game files.
All i did was save, quit, turn off pc, then about 1 hour i came back loaded it up and this is what i have now. Has anybody else had this issue or can anybody help me out?
Thanks a lot.