Post-SP3 patching/Live install problems

I reformatted and reinstalled XP. I installed SP3, and from thereon I've been unable to install any other updates from MicrosoftUpdate, and I also cannot install Windows Live Messenger. No error code, nothing, just "failed."

Problem: A problem on your computer is preventing updates from being downloaded or installed
is all MS Update says.
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Nevermind, problem solved at least as far as MS Update goes. I haven't tried Live yet.

Fix?


1. Click Start > Run and type regsvr32 wuapi.dll

2. Repeat for each of the following DLLs:


regsvr32 wuaueng1.dll
regsvr32 wuaueng.dll
regsvr32 wucltui.dll
regsvr32 wups2.dll
regsvr32 wups.dll
regsvr32 wuweb.dll

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Hello, World!