There are several benefits of going to Windows 7 64-bit:
With 32-bit Windows, you can use a maximum of 4GB RAM. 64-bit Windows 7 runs very fast with 4GB and you can upgrade your RAM to 8 or 16 GB later, making your system future-proof.
A 32-bit OS can theoretically use up to 4 GB of RAM, but 32-bit versions of Windows Vista and Windows 7 see a maximum of 3.25 GB. With 64-bit Windows 7, you can use the full 4GB RAM.
You get better security with 64-bit Windows. All 64-bit device drivers are digitally signed, which means you will not have random crashes. You also get more advanced security features like Kernel Patch Protection with 64-bit Windows 7.
Since 64-bit systems process more information and support greater RAM, Windows 7 is more responsive when you are running complex applications or many applications simultaneously. If you use graphics applications like Photoshop, video editing, games, CAD, etc., you should go 64-bit
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