ok thanks, but i'm trying to check if a number of programs are allready installed on the end-user computer, these are flash 5.0, indeo v5.0, ie 5.5 and windows media 7.0, after i check the registry how can i call my application, and how do i pass the value to the variable, or what i need more then one variable, how can i do this, when i check for the version if not all of them are installed how can i hide the button of the ones installed, and how can i call one by one.

