Jhes how do I go about fixing my dns cache?
hit Start > Run > cmd
when the cmd box is up and running, type ipconfig /flushdns
Also, while you have cmd box up, type ipconfig /all and copy down what the dns servers are... assuming you're letting everything sit at default, then it should either be the dns servers supplied by your ISP, which you should be able to get the info from your ISP itself or do an online search on the IP numbers you see.
Or, if you're behind a Router or the like, the DNS serves should be the adress of your Router.. something like 192.168.xxx.xxx (where xxx is usually dependant on the router manufacturer, but the first set of numbers should be 192.168)
Anything else and its more than likely Malware, even if you didnt pick it up during a scan.. its possible that something got installed before your Antivirus stuff caught it, but not before it started the process of changing certain settings.
You can also go your Control Panel > Network Connections and look for your broadband connection there, right click and choose Properties, scroll down to Internet Protocol (TCP/IP) and click Properties, and see what DNS servers are listed there.
If everything is set to automatic, then its something else... either your ISP just doesnt like AH.com for some reason and is probably blocking it, or if you're behind a router then someone has probably put it on a blocklist.. only things i can think of.