Laptop keyboard not working

I have Windows Vista (32 bit) installed on a Dell XPS 1530. When I attempt to login to Windows the keyboard is completely non responsive. It does work when I press F2 to go into setup mode though. How do I fix it? I really don't want to wipe everything and reinstall Windows. I've already tried restoring to an earlier date from the Windows disk, but it says that there isn't a suitable backup.

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This is a really tough one to fix (if)

If the damage is one I know of, it's not possible for me to write a step by step for this one.

Did you try an USB keyboard so you're sure it's Windows and not the hardware?

Tell more.

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Yes I did

I plugged in a USB wireless keyboard I had lying around. No luck.

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Does the keyboards work in a LiveCD?
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And like I said, it works fine in setup mode.

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Remember I can't write a step by step

There's a keyboard driver from logitech and now a few keyboard loggers that do this. Those I can never write a step by step for. Why? It's too long and too many variations so with that out of the way.

Did you try this in Safe Mode?

1. Use MSCONFIG to disable any keyboard logger or helper?

2. Use Device Manager and delete/remove all keyboards there?

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