The USB port in the Bamboo Slate is merely for charging, it does not transmit data.
To connect the Bamboo Slate to your Windows 10 computer you must use Bluetooth connection and download the Inkspace App from the Windows Store - https://www.microsoft.com/p/wacom-inkspace-app/9ng5x2820fgx?rtc=1&activetab=pivot%3Aoverviewtab
If you download from any other source, it won't work.
Once you install the App, launch it and follow the initial setup instructions.
If you need further assistance, please contact our support: https://support.wacom.com