[ActiveDir] RealVNC removal

[J B]

I'd like to uninstall RealVNC from a number of machines remotely.  These were part of a system image that was rolled out quite some time ago.  Unfortunately, re-imaging the machines (they are laptops) after simply removing the program from the image, is not an option.  Luckily, it's an AD environment - all Windows XP in a Windows 2003 single domain environment.  It appears that the RealVNC app was installed in service mode, and each machine runs the service upon boot.  SMS 2003 is on the network as well, and all of these laptops are SMS clients, but the app was not rolled out using an SMS package or MSI file.   What's the best way to uninstall such an application from all these laptops at this point?  Startup script?  Something else using SMS perhaps (I'm not TOO familiar with SMS)?  I have some ideas, but would welcome any additional input from others, as I am sure that there are better ideas and methods out there that I haven't thought of yet.  If uninstallation is going to prove difficult, I can live with just disabling the service if tha can be done easier than a complete removal of the app.