Page Up and Down keys won't work - have tried everything

My Page Up and Down keys won't work. I've tried hitting F7, the Fn key, checked that the "Always use cursor keys to navigate" box is not selected in the Advanced Options tab and made sure that the "Use autoscrolling" tab is selected. I tried uninstalling and re-installing Firefox, tried hitting buttons F1 through to F12 and then checked that accessibility.warn_on_browsewithcaret is set to 'true'.
It also won't work in Internet Explorer - I have no idea what else to try. My Up/Down arrows are working, just not the Page Up/Page Down buttons. Please help, this is driving me nuts. It's only just started happening; I've never had a problem with it before!

What is the value of the pref [http://kb.mozillazine.org/accessibility.browsewithcaret accessibility.browsewithcaret] on the about:config page?
Start Firefox in [[Safe Mode]] to check if one of the add-ons is causing the problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).
* Don't make any changes on the Safe mode start window.
See:
* [[Troubleshooting extensions and themes]]
* [[Troubleshooting plugins]]
If it does work in Safe-mode then disable all extensions and then try to find which is causing it by enabling one at a time until the problem reappears.
* Use "Disable all add-ons" on the [[Safe mode]] start window to disable all extensions.
* Close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")

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> Date: Thu, 8 Sep 2011 05:17:21 -0600
From: [email protected]
To: [email protected]
Subject: I need help with fp, i cannot get it to work. have tried everything
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>

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As usual,from this ioutfit,total silence.
heres my problem anyone else want to join a class action and
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Additional Information 1: 5670
Additional Information 2: 878e19f58d59849c83981add2b9a7311
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Page Up and Down keys won't work - have tried everything

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