Windows 7 - Simultaneous mouse button press unrecognized.

I have two new Windows 7 computers (laptops) that I run 3D design software on. I have multiple programs that utilize a simultaneous pressing of both left and right mouse buttons (not double-click). This command goes unrecognized in my software and is used extensively to go into 3d rotational manipulation.

I also have a mouse that has the central scroll-wheel button that will activate this feature, but the dual button press also goes unrecognized from from the mouse. My old XP computer recognized this input just fine. I have already been through mouse properties and found nothing obvious. I have also checked for updated mouse drivers.

Most of the well known software companies have Forums on their websites. I think it would be best to ask your question in one of those forums to get answers from people experienced with the software. I'm sure someone has already solved it for Windows 7 if it is something essential to using the program, and not some trick that you stumbled upon that was only a unique system situation.