I've had this problem and Belkin support told me change the Log On account for the wltrysvc service to an administrator account:
1. Right click on My Computer and select Manage
2. Click the + next to Services and Applications
3. Double click on Services
4. In the list of services on the right, double click on WLTRYSVC
5. Select the Log On tab
6. Click the "This Account" radio button
7. Fill in an Administrator user name and password. If you aren't sure click the Browse button, type in the user name, click Check Name and then click OK.
You'll probably have to reconfigure the card after this but it should now work for your limited users.