Stuck in "Ties" when trying to "save" one of the dead soldiers.

[Menicus]

Hello.I'm Menicus from Greece.I've been enjoying the game very much, but unfortunately I'm stuck somewhere early in the "ties" level.
I'm at the room where I'm supposed to save-undo the mistake of the soldier who gets shot after letting a prisoner climb up the pipes.The problem is, everything is happening really quickly for my reflexes-lol-, and I haven't yet figured to what exactly is the proper action.Here's what I'm doing:
Upon starting the sequence, and getting control of the character, I immediately crouch and get the tool-"french key"?, and rush to apply it to the ladder control mechanism.I climb up, but by the time I have climbed up the second ladder, it's allmost too late.I try to rush to the control that is as the left end of the corridor, as in the right end stands the guard,but just in case I'm doing things right, the guard detects me,starts firing on me, and I have option of handling the control.
I'm desperate, I don't know what to do.Plus, for some reason, while all other keyboard commands work fine, I can't allways make my player run, and the the walk/run toggle doesn't work.I have tried selecting a different key, then reseting the keyboard configuration nothing.

Please, consider helping me.It was a lol-ing situation at first, it has turned to a wall head banging one now.

Thank you.

Menicus.