DNS Could not resolve the hostname is an error that keeps coming up for me.

[Innula Zenovka]

Try following the instructions here to change your DNS service to the Google Public DNS instead.    That usually fixes it, and it's a simple and painless operation.

[Innula Zenovka]

Try following the instructions here to change your DNS service to the Google Public DNS instead.    That usually fixes it, and it's a simple and painless operation.

[Rolig Loon]

Should using Google as a DNS not work for you then see here for alternate servers, or grab DNS Bench to help you locate one.