Package a screensaver with credentials

Hi,

I need to install a screensaver on 50 XP clients asap. I've downloaded NSIS but can't find information on how to do this. Is it possible to insert local Administrator credentials into the package. Because the users on the clients don't have permission to install software.

Can anyone please point me to a "how-to"/manual or point my nose in the right direction.

tia, relikwie

MSDN is probably your best bet on this kind of topic.