Microsoft Windows XP - Working With The Classic Start Menu (Microsoft Windows XP)
Microsoft redesigned much of the Windows interface in Windows XP, but if you're not a fan of the new two-column Start menu, you can easily revert to the classic one-column version.
Simply right-click on the taskbar and choose Properties. Select the Start Menu tab and then select the Classic Start Menu option button. If you click on the Customize button you can choose exactly which options you'd like to display on the one-column Start menu.