keyboard keys in game vietcong

[robo135]

bought the game vietcong,loaded it,went to options to keyboard,set the keys,and saved.started the game okay,but as soon as i went to go forward,it stopped,(not the game)then started to go backwards,same for the backwards key.
the left and right keys were okay.the firing key was ok,which is my left mouse.
so i tried it again,it started to go forward and backwards okay,but only lasted for about 10 seconds.
my other games work okay with the keyboard.
can anyone help me with this problem.thanks.