Windows 7 Window 7 32 bit to 64 bit problems

Grant Suk said:

I currently run Windows 7 32-bit with boot camp on a 15 inch macbook pro, but I realized that it didn't fully utilize the hardware, so I decided I wanted to switch to 64-bit. I understand that retail versions come with two disks that allow for one to choose between 64-bit and 32-bit, but I purchased an OEM version through my university, for Windows 7 Home Premium.

My question is if I can install the 64-bit version for free, and if so, how I can do that.
Can someone help me?

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