I have an Intel Pentium 4 531 that windows sees as a dual core, has anyone else seen this? Screenshot:
your windows from what you have posted only shows single core not dual core. look at this link about your cpu. http://www.afterdawn.com/hardware/product_details.cfm/3521/intel_pentium_4_531
I will take another one to show that it will allow me to set the process affinity, windows appears to be reporting this processor as a dual-core.