@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. Click Here To Register...] 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:
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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.