Forum:Can't die

My sons and I all play fallout on the PC. We have two PCs, so we occasionally have a two player LAN game going, as well. Somewhere around level 45-50 for my Hunter, we all became unkillable. We first noticed it in a LAN game with two hunters. When we are attacked, no matter how much damage is done, we never go below 1 hit point. In addition, while in a vehicle, we can't be hurt at all, the sheild never goes down. In fact, after getting an already damaged vehicle the other day, I noticed that every time I crashed I actually gained shield points.

This was all fun, but the challenge has completely disappeared from the game. Does anyone know how to fix this?