What is the best way to update Windows 7 Boot from 32bit to 64bit?

I'm sure this has been answered a number of times, but I can't quite seem to get a search query that takes me where I want to be. Here's the issue.
I have a Macbook Pro 15" Early 2011. I just put 8GB of RAM in it, replacing the stock 4GB. I use Boot Camp to run Windows 7 32bit, which can only use so much of the 8GB RAM (2.16 useable). I've read around and understand I'll need to update to 64bit Windows. What's the most painless way to do this with Boot Camp that will preserve all my files on the Windows 7 boot.
Thank you for your help in advance.

radioactivepal wrote:
So, I should back up Windows 7 while in Windows or should I do that with Boot Camp? I'm a bit confused about the process in general.
You can not 'upgrade' 32bit Windows to 64bit 'inplace'. You will need to perform a custom install, this will erase you existing 32bit installation entirely. Then you can install the 64bit version and all your programs.
How much Ram do you have?
Sorry about that question, I read slower than I type
Don't forget to make a full backup of your Windows files before you start the installation, they will not be there after you finish.

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