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Dell Optiplex 745 BIOS update error message Program Payload Error

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I have a Dell Optiplex 745 with Windows XP Pro Service Pack 3 with four gigs of RAM. I am trying to update it to the latest BIOS update 2.6.6 on Dells website.
I keep getting this error message Program Payload Error. I was able to update the BIOS before this one fine. I think it is 2.6.4 The Service Tag is 5K5SMC1. Thanks for any help you can give me.


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    Program Payload Error.jpg
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Okay but why is that BIOS update on the Dell Optiplex 745 download page. I have seen videos of people downloading and updating that computer. I want to update the cpu in that computer.
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