Addyrulez, could u please POST your script when asking a question, because it can be your script that the problem cause.
Normally GetASyncKeyState(); is the main API windows function for getting a key from the keyboard into a string.
Scar doesn't use windows api's ( watch what u say eduard... )
BUT, u can try using :
TOOLS -> OPTIONS -> API CALS -> ENABLE
* please use this at your own risk, because api calls are serious windows functions who can damage your computer.*
~Eduard