When modern programs get installed, they generally register how to uninstall themselves in the registry. This is where:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall

You have to look in the key for the product name at the "UninstallString" value. Generally adding a switch or two such as -a or -q or -s will get the uninstall to run silently. If it's a Wise install, /s should work.

And there you have it!

-Steve O