How do you push a screensaver to Windows2000 and XP workstations using

We have a policy setup that is copying the files we need to the
workstations but the Screensaver tab settings does not change to take the
screensaver. The screensaver settings is set to "NONE" and reverts back
to this if you logout and back in after manually setting the screensave
to what you want it to be.