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.
Who is Participating?
this tells you how to do it without media (dvd or pen drive) same as windows anytime upgrade:
this also doesn't require a re-install
goprasadAuthor Commented:
please let me know of Microsoft article or URL to this effect.
follow the link above.
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