I have upgraded my motherboard and cpu do i have to reinstall win 7 to change to

I am currently running win7 in the 32 bit mode. my current mother board and CPU are both 32 bit.
I have purchased a new Asus mother board and an I5-2500f cpu. Can I change from 32 bit to 64bit win 7 without a fresh install?

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More about upgraded motherboard reinstall change
  1. Overall, no. You have to reinstall to go from 32-bit to 64-bit. Also, personally, that much of a hardware change, I always reinstall. That way, no conflicts with drivers and such. Plus, if I'm changing my motherboard, It means I haven't reinstalled in a year or two anyway.
  2. No , in order to go from 32 bit to 64 bit you need to perform a clean install.
  3. You would have to reinstall anyway because you have replaced the motherboard. Microsoft will likely require you to re-activate windows with a new activation code because of that. You might be able to convince them to issue you a new activation code if you have the retail version of windows.
  4. To install Windows 7 using the Custom option and formatting the hard disk

    To format your hard disk during Windows 7 installation, you'll need to start, or boot, your computer using the Windows 7 installation disc or USB flash drive.

    Turn on your computer so that Windows starts normally, insert the Windows 7 installation disc or USB flash drive, and then shut down your computer.

    Restart your computer.

    Press any key when prompted, and then follow the instructions that appear.

    On the Install Windows page, enter your language and other preferences, and then click Next.

    If the Install Windows page doesn't appear, and you're not asked to press any key, you might need to change some system settings. To learn how to do this, see Start your computer from a Windows 7 installation disc or USB flash drive.

    On the Please read the license terms page, if you accept the license terms, click I accept the license terms, and then click Next.

    On the Which type of installation do you want? page, click Custom.

    On the Where do you want to install Windows? page, click Drive options (advanced).

    Click the partition that you want to change, click the formatting option you want to perform, and then follow the instructions.

    When you've finished formatting, click Next.

    Follow the instructions to finish installing Windows 7, which include naming your computer and setting up an initial user account.
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