Well, I would uninstall the BT Voyager 2100 software, then system restore to the day before you installed the Belkin.
Then update your antivirus and operating systems as necessary.
Then re-install the BT Voyager 2100 software.
Then link your Dell mini-PCI card to the BT Voyager 2100 - you don't need the 1060 and it's probable that both you and your computer are getting confused.
I've been using a BT Voyager 2000 (the previous model to yours) with my 2 Dell laptops for some time now - and all works just fine.