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Please run the Intel® Processor Identification Utility to properly recognize your processor.
You can download the Intel® Processor Identification Utility at:
Also install the latest BIOS version for your motherboard.
You know I did another search yesterday and finally found a post that I looked at and it was my problem, in msconfig it was set to 1 processor, so I unchecked the box and rebooted and the 4 cores are back.