We’re in the mist of doing an Adobe Acrobat Reader upgrade, and one of my co-workers found this place of code on the net.  The vbscript loops though WMI’s Win32_Product, calling the Uninstall method for each matching product name.
(in the script below, obviously we’re uninstalling Acrobat Reader).

Note: the software must have been installed using Microsoft MSI, for it to be uninstallable via this script.

Function Uninstall_Any()
On Error Resume Next
Set objWMIService = GetObject("winmgmts:{impersonationLevel=impersonate}!\\.\root\cimv2")
Set colSoftware = objWMIService.ExecQuery("Select * from Win32_Product Where Name LIKE 'Adobe Reader%'")
For Each objSoftware In colSoftware
End Function

‘Program starts here
Call Uninstall_Any()

Microsoft MSDN: WMI Tasks – Computer Software