In March 2010 Microsoft will release a Windows update including a browser choice screen that asks you to select your preferred web browser. (Microsoft does so to comply with the settlement with the EU in autumn 2009.) When that Windows update is run on your computer this is what you will see. (Click to enlarge.)

Screen 1	Screen 2

PC-Topp.NET is designed exclusively for Internet Explorer (version 7 or higher) and is not supported under any other browser.

Selecting a standard browser other than Internet Explorer will start PC-Topp.NET in an unsupported browser. This will lead to serious malfunction of PC-Topp.NET!

Therefore we strongly recommend not to select a browser in the browser choice screen but to inform your system administrator!

It might even be advisable for him to disable the browser choice screen altogether.

How to Block the Browser Choice Screen (Microsoft Education Partner Network)