dpinst64 installs an older version of the drivers and should only be installed when running into other issues.
Try uninstalling and doing a clean installation to see if that helps. The sensor should appear under imaging devices in the Device Manager.
What apps are you trying to use and what software version are you instalilng? Older, non-VR apps will not detect the controller when running the latest v4 software. You'll need to download and install the V2 software to use these apps. You can download it from here: https://leapmotion.box.com/s/1mqiux5sxho930521gfqt6f056ygkieq
If you're on Win10, you'll also need to apply the bugfix outlined here: https://forums.leapmotion.com/t/resolved-windows-10-fall-creators-update-bugfix/6585