I was using lfs on my dads computer with my logitech g-force wheel and it was all fine. I have transferred the game and wheel to my computor and all is working well apart from the sensitivity of the wheel has increased severely. I have adjusted many settings but cant find one that decreases the sensitivity. any suggestions? thanks

Depends what you mean by sensitivity but i would suggest either
1) Recalibrate your wheel (in lfs)
2) Turn the turn compensation up

By sensitivity i mean i turn the wheel a tiny bit and the car steers, so i end up driving a full lap using only a tiny bit of lock, which is bad because it makes the car really twitchy and it makes me spin. It was not like this on the other computer.

Set the maximum steering lock in your logitech profiler to maximum...

I do not have a logitech profiler????

Quote from JSturdy :

I do not have a logitech profiler????

Google -> Logitech Profiler -> download -> install -> everything should work fine

Well if LFS picks it up anyway then it could be the wheel needs calibrating if you didn't try that.
Go Options, Control, Axis, then on the bottom right click on the C and press all your pedals and rotate your wheel from lock to lock.

A reclaibration is in order.