MS update breaks IE6 if you’ve played with IE7

As just reported by The register, a recent Microsoft update causes problems with Internet Explorer 6 if you’ve previously run version 7 (beta) in ‘standalone’ mode.

This hit me, but I was blaming it on a recent install of the Opera web browser as that and the update coincided, so apologies to Opera. The problem I was experiencing was that when typing in a URL in the address bar, or opening a bookmark, IE was launching the default browser (which could look like a new window if IE was set as the default). Kind of cool, but not when you use apps that require IE and use popup windows

The solution is to delete the registry key:
HKEY_CLASSES_ROOT\CLSID\{c90250f3-4d7d-4991-9b69-a5c5bc1c2ae6}