RESOLVE: Cannot resolve host address

[Believer_01 0]

Hello guys, 

I would necessity your support.

After being connected by OpenVPN GUI (with a file previously realized in the config section), I change the IPv4 parameters by Netsetman and here what it appears in the log:
 

RESOLVE: Cannot resolve host address: it.vpn.airdns.org: Il nome richiesto è valido, non sono stati trovati dati del tipo richiesto. 

So, I can't surf and I have also leaking, that is actually what I want to avoid.

I use Win7 with AVIRA antivirus and Privatefirewall.

Thanks.