x86 refers to a type of processor architecture that is ubiquitous in today's computers.  These include most products released by Intel and AMD such as the Pentium 4, Celeron, Atom, Core Duo, Core 2 Duo, Core 2 Quad, i3, i5, i7, Xeon, Athlon, Neo, Phenom, Opteron, among others.

There are a few CPU types that do NOT belong to the so-called "x86 family", usually reserved for servers.  The most common one is probably the Itanium processor.  Very few PC's if any, still use this processor.

We had to restrict Doxio to run only on x86 to ensure full compatibility with 64-bit processors now common in mainstream Windows 7 PC's.

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