KB946648 Installation fails.

Hi, Greetings for the day.
I am trying to install Security update KB946648 on Windows XP SP2 pc but the installation fails with error
"Required installationbranch was not found in INF file" . Attached is the Log of the kb installation log file.
Processor of this system is AMD Athlon xp 2200. and 512 mb of ram.

Pls advise.
Thanks in advance.
KB946648-Inst-Err.log
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zzingalalaAsked:
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zzingalalaConnect With a Mentor Author Commented:
Tired after trying all solutions.. There is no zone alarm installed but yes MSN is there. I Finally reinstalled SP2 and then reinstalled the patch. It worked for me. Thanks you all for your time, Efforts and Suggesstions.
God bless u all.
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orangutangCommented:
Can you also send your C:\WINDOWS\windowsupdate.log file?
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JonveeCommented:
You could try opening a command window and registering the following DLL's >>

net stop wuauserv (this stops the update service)
regsvr32 wuapi.dll
regsvr32 wuaueng1.dll
regsvr32 wuaueng.dll
regsvr32 wucltui.dll
regsvr32 wups2.dll
regsvr32 wups.dll
regsvr32 wuweb.dll
net start wuauserv (this restarts the update service)

OR simply follow these instructions>
http://support.microsoft.com/kb/943144
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orangutangCommented:
Also, from doing some research, it seems that the only solution is to uninstall ZoneAlarm.
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jcimarronCommented:
zzingalala--Perhaps of help
http://www.driverforum.com/graphics5/13372.html
P.S.  Are you using Windows Messenger and/or Zone Alarm?
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