P5B Plus Q6600 only uses one core

I just set up a new system using the P5B Plus and a q6600 processor. It
appears that it is only using one of the cores on the processor. Windows
task manager only shows one window. The system runs slower than the old
2.6G processor it was supposed to replace. Is the processor bad or did I do
something stupid in the setup or bios? I did upgrade to the new bios 604,
which didn't help.

Thanks,

Jim Krol
.

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