I'm deploying IE's toolbar, having 2 version, one for IE7, and another for IE8, IE9.
I need an installer allow me to check current version of IE, and then run exactly .msi file for each situation.
Thanks in advance.
A better solution would be to use a single MSI file which handles all IE versions. Either way, there are multiple setup authoring tools which support what you need.
If you want a free tool you can try WiX. It has a steep learning curve, but it gets the job done.