Sharepoint Access

I have started to use Sharepoint that seems to ship with SBS 2003, however in the default login script is:

"\\SERVER1\Clients\Setup\setup.exe /s SERVER1"

This runs a Client Setup program that configures any applications and also seems to set the users Profile to have a homepage of:

"http://companyweb.com"

And also sets there Favourites etc. This seems to work great if your the Administrator or have Administrative privilges but everytime users login they get an error message that they don't have sufficent rights to install software.
Is there anyway to get round this??