I believe the one on the case is the individual license for the PC but the one Keyfinder brings up is a "Volume License" used to install across many machines so Dell don't need to enter 20,000 product keys a week by hand.....
Microsoft allow the use of one volume license key for a certain number of PC's.
When a PC is made, the hard drive is ghosted from a master copy held on a ghost server, the license key will allocated for a certain model, usually all models with a particular motherboard will use the same key. This has two advantages, one manufacturers do not have to enter the license key individually into thousands of PCs, and two the end user does not have to activate the PC when they get it, and when they inevitable have to reload it.
If the motherboard is changed for a different model the PC will then need to be re-activated, as the license key is locked to the old motherboard. We used to get round this altering the DMI string on the motherboard to match the one on the old board.
Both key's are the same. The one on the sticker gets modified by XP when you impute it to the system. It changes it so it does not look the same. If you use the one that software find and try to load XP with it, it will not work. The key on the sticker as letters and numbers I think the other that shows is only numbers
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