X300 Can't connect to Mobile Broadband - Windows 7

[ranjanv]

Using the Sierra MC8775 card which worked well on Windows XP using the Thinkpad Mobile Broadband Connection software.

Upgraded to Windows 7 32-bit recently. The latest Access Connections and Mobile Broadband Connection software has been installed. Access connections keeps telling me the error is related to APN settings. I called my mobile provider - They've given me the APN settings and they can see my number connected to their network. But I just can't connect to mobile broadband!

The same SIM card works fine if I use the external USB dongle.

I am not using the Sierra 3G watcher at the moment....should I get it installed? Any ideas?