Windows 7 comes with two disks, one for 32 bit and one for 64 bit. You can choose which one you want to use based upon your devices, and your needs.
If you are upgrading from another version of Windows, you can’t change unless you do a fresh install.

If your computer supports 64 bit and you aren’t using extremely old software, I would suggest going to 64 bit if you are doing a new install anyway. It will still run 32 bit programs, and you will may benefit from the 64 bit version.

You might consider adding some memory as well if you want since you can use more than 4GB memory with the 64 bit version. If you are using an older computer with minimal memory anyway, I would just stick with the 32 bit version. Microsoft has a nice feature on their Windows 7 website to check compatibility with Windows 7 in both 32 bit and 64 bit, so you can see which of your programs may be an issue.
Microsoft Windows 7 Ultimate

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