How to upgrade W2K8 R2 STD OS to W2K8 R2 Ent on a server

Hello experts,

I have installed W2K8 R2 STD on a BL server with 96 GB physical memory, but W2K8 R2 STD OS has a limit of 32 GB physical memory. We have decided to upgrade OS to W2K8 R2 Ent.
How should I go about upgrading the OS, has it to be from scratch?
This server will be used to host SQL 2008 DB's.
Please advise.

Thanks and Regards.
goprasadAsked:
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remixedcatCommented:
this tells you how to do it without media (dvd or pen drive) same as windows anytime upgrade:
http://blogs.technet.com/b/server_core/archive/2009/10/14/upgrading-windows-server-2008-r2-without-media.aspx
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remixedcatCommented:
this also doesn't require a re-install
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goprasadAuthor Commented:
please let me know of Microsoft article or URL to this effect.
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remixedcatCommented:
follow the link above.
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