I don't know how to enter Windows Setup Media. Do I have to press certain buttons F2,F6 etc? as the computer starts?

Thank You for your reply. I don't class myself as thick but your instructions are a bit beyond my level. If possible could you please give step by step directions etc.

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Following recent Windows updates, I find that when starting my computer, when the opening screen appears, when, I press the ENTER key to allow the password to be put in, the box appears but while...