Try the Resolution in this KB article (ignore the title):
When you try to install an update for the .NET Framework 1.0, 1.1, or 2.0,
you may receive Windows Update error code "0x643" or Windows Installer error
code "1603":
http://support.microsoft.com/kb/923100/
--
~Robear Dyer (PA Bear)
MS MVP-Windows (IE, OE, Security, Shell/User)
AumHa VSOP & Admin
http://aumha.net
DTS-L
http://dts-l.org/
VistaHeadache wrote:
> Vista keeps recommending the same update after I install it...it even
> recommended another update from 3 months ago all of a sudden. Mainly
> "Security Update for Microsoft .NET Framework, Version 1.1 Service Pack 1
> (KB929729)" is the one giving me trouble. Any help would be appreciated.