Please help us out.
We can't see your machine, so we don't know:
What type of machine it is.
What operating system you are using.
Which browser.
Which sites you can't access.
What messages you have been receiving.
Who or what informed you.
What type of internet connection.
If you have a firewall, anti virus software or anti spyware applications.
The more information we have, the more likely it is that we can help you