Fastest way to update 500 XP machines with patches?

I have a deadline to meet and I won't make it without a very good, very dependable automation tool.  
I know there are some out there but I need something dependable.  Would like some input on what
you have used that you loved, liked and disliked.  Your input will truely help.

Derri
dlpierceAsked:
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Lee W, MVPTechnology and Business Process AdvisorCommented:
Why not go with free, Microsoft product that supports 2000, XP, and 2003 - Windows Server Update Services
http://www.microsoft.com/windowsserversystem/updateservices/default.mspx

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Lee W, MVPTechnology and Business Process AdvisorCommented:
Why the B grade?  What about it don't you like and why wouldn't you comment and give me the chance at an A grade?
dlpierceAuthor Commented:
ok...just read your profile....here's my comment.

I am working on a secure network and can't connect to the commercial network for updates.  All my updates are on a server.  I need to point the software to the server/updates and push them out to the machines
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Windows Server 2003

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