Yesterday I recommended the Windows Vista Upgrade Advisor in my post "How can I find out if my PC is compatible with Windows Vista?"
A reader commented that he having difficulty using the application, getting an error msg that he "didn't have an internet connection and it can't contact the web service."
So I tried it out on my remaining PC at home that is not running Windows Vista (waiting for an updated driver) and the Upgrade Advisor (aka VUA) ran fine. Then I tried it on the kid's PC, which runs Windows XP due to the number of old games running under Windows 9x... guess what? Upgrade Advisor failed to connect to the Internet.
Well, I spoke with the Upgrade Advisor team (thanks, guys) and they gave me the following advice: if you have problems connecting to the web service during the scan, please carry out the following steps: