InPlace upgrade 2008r2 Foundation server to Standard

I have a 2008r2 Foundation server that I need to do a 2 way Trust to another domain.  The os has informed me that this function is not allowed under Win2008r2 Foundation.  
So now I have to do an inplace upgrade to 2008r2 Standard using:
DISM /online /Set-Edition:<edition ID> /ProductKey:XXXXX-XXXXX-XXXXX-XXXXX-XXXXX
I have since found out that DISM does not work on a AD DC.  So  now what do I do.  If I demote the DC dont I loose all my AD and Settings and Why would you have a Member DC on a 10 User network to move FSMO roles to.  

So in My situation is an InPlace upgrade even an option?  If it is How.  It is a full production network so I cant be down for days rebuilding.
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Michael PfisterConnect With a Mentor Commented:
Sorry, but you can't upgrade a 2008 R2 Foundation DC to Standard. You would need to demote it.

Also it looks like ADMT isn't supported on 2008 R2 Foundation so I believe you're stuck and have to move computer and user accounts and data to the new domain manually.
stevepcswinAuthor Commented:
Not what I wanted to hear but what I thought was the answer from my own research.
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