This was a very annoying problem with the PC I was using. Running on Windows 2000, it has tons of problems… and I think it is due to the fact that I was not able to patch the OS for nearly a year. Hahahah… anyway… found the solution:

Go to command prompt and type the following in order… line after line:

regsvr32 MSXML3.dll /s

net stop wuauserv

cd /d %windir%\SoftwareDistribution

rd /s /q DataStore

net start wuauserv

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Voila… it should work now. :)