Authentication fail error when instaling driver

Hi

I have have a XPS L502X.

I decided to make a clean installation based on Windows 7 Ultimate.
My problem is when I instal the driver for the "Dell Wireless HSPA 5540" it fails with then warning:

"Authentication failed. The .... driver cannot be installed on this computer...."

Do anyone have an idea how to install driver for this ?

Thanks

Regards
BQJ