The PrivitizeVPN uninstallation should not affect a 3G device's installation. However, it's possible that the uninstaller was corrupted and affected other programs or devices as well. Go to Device Manager (Start > Run > devmgmt.msc). While the 3G device is plugged in, right-click the item in the Device manager and choose Update drivers. You can use Windows Update or Automatically file searching. If you get no result, install the software for the 3G device and reboot the PC. Everything will be installed afterwards.