Click Start.
(If you are using the classic Start menu in Windows XP, or if you are using
an earlier version of Windows than Windows XP, now point to Settings.)
Click Control Panel.
If you now see the text "Pick a category", find the icon named Accessibility
Options and click it. The window contents change. Under "or pick a Control
Panel icon", click on Accessibility Options.
If you don't see the text "Pick a category", find the icon named
Accessibility Options and double-click it.
You have now opened the Accessibility Options dialog box.
In the FilterKeys section, you can turn FilterKeys on and off by using the
Use FilterKeys check box. Clicking the Settings button brings up a window
where you can set FilterKeys options, or turn off the keyboard shortcut.
Click OK to accept your changes.
If you want to launch the Accessibility Options dialog box through the Run
command on the Start menu, you can click Start, and then Run, and type
"access.cpl" without the quotes, and press Enter.