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Generally, you access and bring up OSK (on-screen keyboard) in Windows 7, by going to
Start button ,
clicking All Programs,
clicking Ease of Access,
and then clicking On-Screen Keyboard.
If you are in the initial screens and the start button is unavailable, try tapping on the icon(s) visible in the corner(s) of the screen. One should be the 'handicapped access' icon, and should allow starting the on-screen keyboard.