This was addressed by someone else last October but the thread turned into a discussion about SDHC cards.

Here we go again. Installed update wizard on my Windows 2000 SP4 machine with .NET framework running.

Started the wizard and followed the instructions.

The wizard successfully found my N800 but upon clicking on the <NEXT> button, the next window displayed this:
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Unable to start update

Authentication failed

The update server could not authenticate you, because your Windows clock is not on time. See Windows Help and Support for instructions on how to set the correct time

1. Set your windows clock to the correct time.

2. Use the next button to try again.
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Now, my Windows clock is synchronized with the time standard in Colorado with a NIST server program every time I turn on the computer on so it couldn't be more than a second off.

Why does the update server even care about the time?
What time is it looking for? After a certain date or before a certain date?

I'd like to upgrade my N800 to OS2008 and it shouldn’t be so hard.