How to upgrade to SP 3

I have just taken possession of a reconditioned Dell Latitude D430 for use by a charity. The laptop is running XP SP2. I want to install MS Security Essentials but need to upgrade to SP3 first.

I have tried to run Windows Update but cannot do so, the system returning an error 0x8024400A. I am encouraged to download and install Mr Fixit. Mr Fixit does not work until I upgrade to SP 3, so I am in a loop of frustration.

Can anybody provide advice?

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I've yet to find the one, the only, the single cure all for
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A better way.
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Preparing For The Upgrade To SP3
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upgrade to SP 3
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Many thanks

Thanks for all the replies, the issue is now resolved - SP3 is installed, Windows Update is working and Mr Fixit has gone to that big bin in the sky.

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