Only Administrator users have access to network

I can only gain access to the wireless network if I'm logged on as a user
that has admin rights.

Here's what I'm running:

-A Belkin Wireless G Desktop Network Card
-A DLink AirPlus Xtreme G High-Speed 2.4GHz (802.11g) Wireless 108Mbps1
Router
-Windows XP with SP2

Now the network works great if I'm logged on as administrator, but not if
I'm logged on as a regular user (power user). I know it has to do with the
rights, because if I give my regular user Admin rights, it works again. What
rights (specific to this problem) does an admin user have that other users
don't that would create this problem?