This is a 32-bit machine, right?

[BobLewiston]

I've got a Pentium 4 machine - the exact architecture is GenuineIntel x86 family 15 model 2 stepping 7. (I'm running Windows XP Pro, version 2002, Service Pack 3 with no problem.) This is a 32-bit machine, right?

[oracleguy]

Correct. That should be a Northwood core Pentium 4, they do not support 64-bit.

There were a few late model P4s like the Prescott 2M and Cedar Mill based ones that had 64-bit support. But the power dissipation from those is crazy high if I remember and if you want 64-bit support you are much better off moving up to the Core 2 line.