You receive error code 0x80070643 oя error code 0x643 when you use the
Windows Update or Microsoft Update Web sites to install updates
<http://support.microsoft.com/default.aspx/kb/958052>
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After 12 April 2010, XP SP3 your computer will NOT be offered ANY critical
security updates nor will Windows Update website be available until & unless
you get XP SP3 installed.
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When you try to install an update for the .NET Framework 1.0, 1.1, 2.0, 3.0,
or 3.5, you may receive Windows Update error code "0x643" or Windows
Installer error code "1603"
http://support.microsoft.com/kb/923100
When installing updates using Windows update or Microsoft Update you may
receive Error 0x643 or 0x80070643
http://support.microsoft.com/kb/976982
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TaurArian [MVP] 2005-2010 - Update Services
http://taurarian.mvps.org
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Disclaimer: The information has been posted "as is" with no warranties
or guarantees and doesn't give any rights.