Keeping in mind i know very little about visual basic:
How do I make a command button in visual basic launch another application or file (in this case a .avi file on a cd) Its a autoplay application on a CD
You can either use VB's shell() command, or the Win32 function ShellExecute(). shell() is much simpler, but ShellExecute() is more powerful. A Google search on either of these should give you plenty of code samples.