Upgrading from Windows 7 Ultimate RC to Windows 7 Professional?

Can any one guide me how to upgrade from windows 7 Ultimate RC to Windows 7 Professional.
Is it possible to upgrade without out new installation ?

If possible please guide me


Thanks Drew for your swift reply

I'll definitely go for a fresh installation.
Regard to my user name that I've no stock with Vodafone I wish I had it. My mobile phone is from Vodafone that's why I picked the name. :p


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