Why can you not run on Fallout 3?

Answer 1

Unable to Run on Fallout 3If you are unable to run on Fallout 3, you are carrying too heavy a load. To lighten your load, you can eat foods, drop things and repair armor or weapons. If you have Jericho you can trade things with him, too, so your load isn't as heavy.

Tip. If your not overloaded and still unable to run, try hitting your caps lock key, this toggles between always walk/run.

Tip. If you are overloaded and can not find a trader, look for a box, locker, first aid kit, desk etc. and dump some of you kit there, remember were it is so you can go back and get it. Personally I use the locker at the base of the ramp just outside Rivet city, but you can choose any location so long as it's safe.

BuddyBoy77 EditI was unable to run once on Fallout 3, too. I don't know if this is a glitch or what, but I went swimming in some Radiation water and it seemed to cure me. I don't know though. Haha, I did just get the game on Wednesday and im only a level 3.