I had posted this query in the forum somewhere. When you insert the dongle, it installs its software and a USB modem. Then you can't install another dongle unless you uninstall the first one. Someone said that you can connect a broadband and a dongle together, start the broadband first.
You mean that the dongle software is not installed on your PC ?? Or do you use different PCs for different connections ?
What is mobile tethering ??