32-bit or 64-bit: Which version of Windows 8 to install?

Both 32-bit and 64-bit installation discs are included in the Windows 8 package. 64-bit operating systems can handle large amounts of memory—typically 4 gigabytes (GB) of random access memory (RAM) or more—more efficiently than 32-bit operating systems. However, not all computers are 64-bit capable.

You'll probably need the 32-bit version, but to make sure right-click My Computer, and then click Properties.