Mine freeze when shutting down or rebooting. Here is one solution (works for me): right click on the start bar, start "task manager", there is a menu item called "shutdown", with submenu "shutdown", "restart", "logout" and so on. Here is the trick: hold down "ctrl" and left click "shutdown". XP will write back anything it needs to save and do a quick shutdown (skip some routine shutdown procedure, but there is no ham to your windows xp system!). If you are using some single mouse emulation software and use ctrl+left click=right click, this won't work.