Now you're really getting me confused.
A further DNS test (when you can't access any web pages) is to enter 91.186.31.12 (instead of a 'www' URL) into your browser's address bar. That bypasses the DNS and routes your request directly to AB's home page. If you can see that, it's definitely a DNS problem.
The DNS details I gave you are for a public DNS, which anyone can use. If that doesn't work, try my original suggestion again but using the DNS details for your own ISP. You can find these on the support pages of your ISP's website but it might be quicker to look here
http://www.kitz.co.uk/isp/dns.htm
or here
http://www.idl.uk.com/email/isp_settings.htm
If entering 91.186.31.12 into the address bar doesn't take you to AB's web page, then your firewall would seem to be the most likely cause of the problem. You state that Zone Alarm was uninstalled but you've not said whether it (or another firewall) is currently running. (If you've got any 3rd party firewall running, it's important to ensure that the Windows firewall is disabled). Go into the Task Manager and close any active firewall, together with anything else which you don't currently require, and try again.
Chris