Resetting computer

How do I reset the Driver Information Center. I am not just talking about setting the trip and mileage info to 0, I am talking about a complete reboot of this information center.
I realize that the mileage would not be reset and am not looking for that. My menu on the dash is missing the instant mileage option an it cost $100 to go to the dealer to have him reload the software.
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Did it ever have the instant mileage info? You don't say what year truck but I think 04 (maybe 05) was the last year this was on the DIC. I know 06s don't have it.

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Do not the answer to that question. Have only owned it for about two weeks now. Other 04 Avalanche trucks that I tried out had this and I just assumed that all would be the same. Maybe I am wrong and they had two versions of software for this year. Dealer is ignorant on this matter.
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