Control Mouse with onscreen keyboard?

Does anybody know how to? I want to play older pc games where the touchscreen input can be recognized. Its like the touch input is either not working or the calibration is way off? I was thinking about a gamepad like up, left, right, down arrows and whatever keys you assign for the game? This would make any pc game work I know some people have used dxwind to run games in windowed mode which helps but some games touch is not working.