>>> cannot receive or send messages
Well, I'm guessing that you're referring to email but it could, of course, be a messaging service (such as Windows Live Messenger). It does help to know these things!
Then, assuming that it actually is email, we need to know how you access your mail. Is it by going to your email provider's website or is it via a dedicated email client, such as Outlook Express, Thunderbird or Windows Live Mail? Or, indeed, is it via an email app on, say, an Android device?
If you provide the relevant information we might well be able to help you. Without it there's no chance!