Should you get an error regarding your TAP/TUN Adapter, please follow these steps:
Open File Explorer, and navigate to c:\program files (x86)\proXPN\bin, then right client deltapall.bat, select Run as Administrator. After that, right client addtap.bat, and select Run as administrator. then restart proXPN.
If that doesn’t help, you may need to reset winsock:
Type Cmd in the Start Search text box and press Ctrl-Shift-Enter (keyboard shortcut to run Command Prompt as Administrator). Click Continue to allow elevation request. 3. Type netsh winsock reset in the Command Prompt shell, and then press the Enter key.
Also, open Control Panel, Network and Internet→Network and Sharing Center. click Change adapter settings on the left, then right click TAP-Windows adapter, select disable; after disabling it, then select Enable. After TAP-Windows adapter is reset (by disabling and then enabling it), restart proXPN and connect.