The key combination to lock the computer in Windows XP is the Windows Logo Key + L. It sounds like one of the two Windows Logo keys might be stuck down.
If you press the "L" key, and it logs off, then you are probably pressing the "Ctrl+L" combination. Check to see if your "Ctrl" key is stuck.
press 'windows logo'+'p' then click disconnect projector
Restart your computer and start pressing the F8 key on your keyboard. You need to press F8 before the Windows logo appears. If the Windows logo appears, you need to try again by waiting until the Windows logon prompt appears, and then shutting down and restarting your computer. Note: On a computer that is configured for booting to multiple operating systems, you can press the F8 key when the Boot Menu appears
Windows Recovery Enviroment (Windows RE)
You Plug in the Keyboard then Press F3!
Restart your computer and do not use windows
No one likes a Windows XP slow startup. When you startup your computer you want it to be ready to use immediately. I can not make it that fast, but I can help you fix slow windows xp. Read more: http://slow-xp.com/how-to-fix-slow-window-xp-and-optimize-your-computer.html
Sometimes, the only thing a person can do to fix a slow Windows 2000 computer is to reset it to factory defaults. Perhaps the computer is running slow because the memory is used up. In this case, delete things that are not necessary on the computer or download them to a disk.
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press ctrl, alt and up. hope this helps :)
Contact the MFG and get a new button.
(microsoft vista) You press start then press control panel. Then you select appearance and personilization. Then you press adjust screen resolution, and viola!