"You do not have access to make the required system configuration modifications" error when trying to install Macromedia Flash Player

I am attempting to install Macromedia Flash from http://www.macromedia.com/go/getflashplayer and after I press 'Yes' on the Security Warning dialogue, I get an Error message pop up saying "You do not have access to make the required system configuration modifications. Please rerun this installation from an administrators account."

My user account is in the Administrators group. I've even tried logging on as Administrator and it doesn't work from this account either.

My IT department have been unable to resolve this as yet, so I don't think it's a trivial problem.

Any help greatly appreciated!

PS: The solutions in the first two results on this search - http://search.experts-exchange.com/search.jsp?query=%22you+do+not+have+access+to+make+the+required+system%22&searchType=all¤tTAID=503 - do not work, i.e., checking the permissions in the Registry, etc.
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What OS are you running?
I'm assuming you're running XP SP?

Are you logged in as a local administrator?

We lock down network Domain Admin accounts, so this could be the case.
It sounds like your IT department goofed your machine somehow.

I'd reinstall the system myself and I bet Macromedia Flash will install fine out of the box in default settings.

I wouldn't waste any more time fooling with someone else's idea of a secured, but unuseable system.  

My $0.02
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XtreemAuthor Commented:
I eventually found the solution to this:

It seems from the thread that it's a Dell screw up. So it would appear my machine has been configured wrong by the manufacturer.

Anyway, the solution described in the thread (setting the correct permissions on HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Setup) has fixed the problem.

BTW, Dell also loads remote control software (a backdoor) on their desktops.  I can't think of the name of the software, but another user posted here several months ago and thought that it was spyware that was loading improperly and it turned out to be some not so interesting software from Dell.

Hey, value add. ;)
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