In case anyone hasn’t been paying attention to the yellow exclamation mark on a shield in yout taskbar, Microsoft has issued an “update” (more like “force-feeding” if you allowed Automatic Updates to “automate” downloading & install of updates) by the name of “Windows Genuine Advantage Notification”. To prevent this, follow the instructions on this page. However, in the section “How to AVOID INSTALLING the “Windows Genuine Advantage Notification” tool”, there is a link to configure Windows to not display the “Install updates and shut down” option, and this requires gpedit.msc (Group Policy Editor), which Windows XP Home (which I installed wrongly, and will change to a legitimate Windows XP Professional Edition as soon as I free up enough disk space) does not run. However, some functions in gpedit.msc only changes registry values – therefore, Group Policy registry values can be set in Windows XP Home without the need for gpedit.msc. This link will detail the registry values needed to change registry values associated with Automatic Updates and the “Install updates and shutdown” entry in the shutdown dialog box when you shut down Windows XP.