Step 1. Install “Windows XP Mode” using Microsoft Virtual PC on Microsoft Windows 7.
Step 2. Windows XP warns that there is no anti-virus program installed. Use the supplied Internet Explorer 6 to try to download Microsoft Security Essentials. Browsing to the page fails. I happen to know that this is a manifestation of a browser incompatibility.
Step 3. Use the Bing search box on the default home page of Internet Explorer 6 to search for “Internet Explorer 9”. You have to scroll down a long way before finding a real Microsoft link: who knows how much Malware the earlier links would serve up?!
Words fail me, really.
Postscript: it transpires that IE9 doesn’t work on WinXP. Microsoft offers IE8 instead.