Problem with shutting down computer

My parents had a problem with shutting down their computer recently. After they would click on "shut down", system would freeze and "shut down" option box would take 3-4 minutes to come up. It was pretty annoying. I checked their computer and found following error message on every shutdown attempt:

"the server {9B1F122C-2982-4E91-AA8B-E071D54F2A4D} did not register with dcom within the required timeout."

I did some research myself and cam across an article with fix that was exactly what fixed this issue. What I did was run some regsrv32 commands on few dll's causing the issue. After this was done my problem was resolved. Below is the list of commands ran.

net stop wuauserv
regsvr32 /s wuapi.dll
regsvr32 /s wups.dll
regsvr32 /s wuaueng.dll
regsvr32 /s wuaueng1.dll
regsvr32 /s wucltui.dll
regsvr32 /s wuweb.dll
regsvr32 /s jscript.dll
regsvr32 /s atl.dll
regsvr32 /s softpub.dll
regsvr32 /s msxml3.dll
net start wuauserv

Helpful article was found @ http://www.windowsbbs.com/windows-xp/47229-problems-shutdown-reboot-logoff-dcom-automatic-updates.html