On a Sony Vaio VPCW111XX netbook, running Windows XP Home SP3, I installed dotNET Framework v4.0. The installation completes successfully, but subsequently shutting down the computer results in a dialog box with a message about something called a "Wireless Switcher" which must close and the option to "End Now". This happens EVERY time the computer is shut down and is very irritating. Restoring the computer from a backup image to the point immediately before installing dotNET v4.0 cures the problem, so it is definitely related to this update. Any ideas, guys ?