I doubt it's malware that would block just one particular site. I know certain ISP's have been selectively blocking sites that have caused excess traffic but of course they would deny that.
You aren't alone here, read this thread to see if any of the suggestions there help: http://forums.moneysavingexpert.com/showthread.php?t=1934293
You could try the Hijackthis idea near the bottom of this thread: https://community.mcafee.com/thread/1996
I can access the Guardian OK here on Rogers.
Thanks for your suggestions, but, the problem continues. I still feel that I have been infected by malware.
Your message at https://community.mcafee.com/message/162339#162339
suggested that I go to http://forums.moneysavingexpert.com/showthread.php?t=1934293
where I found the instructions:
1. Browse to http://184.108.40.206 If that turns up the guardian for you, then the problem is DNS.
2. Go to Start > Run> Type cmd and click OK > type ipconfig /flushdns into the black box and hit enter.
I followed the instructions.
1. I was able to browse to http://220.127.116.11 but I was still not able to reach Guardian.co.uk
2. At the command prompt I typed in "ipconfig /flushdns"
The immediate response was "Successfully flushed the DNS Resolver Cache"
That did not solve the problem.
The problem started when I clicked on a link while reading an article on Nov 25 about WikiLeaks at http://www.thestar.com/ I got the following error message: "Server not found: Firefox can't find the server at www.guardian.co.uk."
Do you have any further suggestions?
Did you download Hijackthis and post a log on one of the specialist forums along with the problem as I suggested above?
They should have suggestions on what's the best thing to do in this case.