@xxlfozy
I can't understand why you're having problems other than now by re-installing an older version of the Garmin USB driver over [Only registered and activated users can see links. ] you've caused a compatibility problem. Using current usb driver both current BC v4.2.5 and the beta release of upcoming v4.3.0.2 work well in my Windows 8.1 with my SP 2610:

BC 425

BC 4302

Maybe you need to completely uninstall everything and start again. It is possible to run the beta version of BaseCamp 4.3.0.2 side by side with an earlier version.