You don't have to change that line at all. SETM SS= is just setting a arbitrary variable(SS) to nothing. But when you do this, it makes explorer check the settings in the registry for updates. This doesn't work for everything, but it usually works for Screensaver settings.

See this post for more details: Applying Registry Settings

I would be willing to bet, Jen's UDF does very much the same thing, so if that UDF is not working, this may not work either.