Group policy-Windows 2003 server

I set up a software instalation policy(user conifguration>software setting) so when users connect to windows 2003 server(small business), windows will automatically install certain apps(outllook 2003, IE 6 etc.).

However, users get the following message:
“You must be a member of the local aministrators security group on this computer to install and configure applications. contact your system admin”.
And the application installer halts. It works only after I set up a user for them on their local pc with admin previleges..
Is there a way around that; Can I get this policy to work without setting up users as admins on their local pcs????

I’d appreciate your help!!
Thanks
Canaan