Some problems with options

Hey guys,

everytime i suck in sniping because i have set the aiming sensitivity to 100 If i set it to default it jumps back to 100, do you know any trick, like deleting a "settings.ini" or something ?
And my second problem is i am german so i have a german keyboard^^, if i want to see statistics, i press tab but nothing happens. Later i figured out i can swap the Layout in windows that works great but if i want to write something it looks like this: Zou owned me, or Y8games rock xD so u can see the Y and Z is swapped do u know a solution??
E: Oh i think i got a solution for the 2nd problem http://www.microsoft.com/downloads/details.aspx?FamilyId=FB7B3DCD-D4C1-4943-9C74-D8DF57EF19D7&displaylang=en