Stan,
My EL5 installation , in Help--> About, reports that the System is Windows 7 version 6.1 running on AMD64: en_AU (expertlotto).
I do not use any AMD CPUs. I am running 64 - bit Windows 7 on Intel(R) Core(TM) i7 CPU 870 @2.93 GHz.
I do not know whether it has any practical significance. I do not see other problems. It seems that the latest EL5 works normally.