Upgrade Windows 7 Home Premium OEM?

My new computer came with Windows 7 Home Premium installed. I have an expensive slide scanner and an early Photoshop Elements program that won't work in a 64-bit environment. Drivers are not available. Everything worked with Windows XP. Does upgrading with a key from an OEM version of Home Premium to Windows 7 Professional yield the same build as a clean install from a purchased disc, e.g. does it have the option of using the 32-bit and/or 64-bit mode? If limited to one version is it possible to switch to the other later? Is the 32-bit mode virtual Windows XP? I have searched several forums and found a lot of confusion and no clear answers.Thanks in advance for any help you can give. A custom (fresh) is recommended for all upgrades, because it tends to be more stable, but to make sure it is clear: the upgrade in place option is ONLY available from the corresponding Vista version/Bit-size. So if you had Vista Home 32-bit then you could only upgrade in place to W7 Home Prem 32-bit. If you were XP it has to be a custom install. If switching from Vista 32 to W7 64 (or God forbid from Vista 64 to W7 32) then again it is a custom install. And if switching from Ultimate or Professional to Home Prem then again it's a custom install....

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