Try to check the following:
1. Please check your dns baka nakamanual, set to default nyo lang.
2. Punta ka sa device manager uninstall nyo muna tap adapter tapos balik dun sa folder ng openvpn din install nyo ulit yung tap-windows adapter and try run as admin openvpnportable.exe
3. Try some other servers also to test.
4. Default APN lang.