Windows Vista Ultimate SP1 X86 (HP OEM DISC) Serial Key Keygen
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The Dimension 5100 was sold by Dell with only Windows XP and maybe in some cases Windows Vista. Thus Dell have only placed the markers for Windows XP and possibly Windows Vista in the system BIOS. They have not placed the Windows 7 markers in the BIOS and the activation mechanism will therefore sees an invalid BIOS and hence will not activate. See notes on ineligible systems: -clean-install-of-windows/microsoft-product-activation/the-activation-backup-and-recovery-program-windows-vista-7-version/#Ineligible
In your case you have purchased a Reinstallation DVD and a COA so phone activation may work: -clean-install-of-windows/microsoft-product-activation/phone-activation-windows-vista-7/In reality a Dell Windows 7 COA should not be sold separately from a Dell system so it is also possible you were sold a non-genuine license. Theres lots of piracy of fake Windows 7 COAs and for these reasons COAs are removed in Windows 8 and later. The system builder OEM license is usually just Microsoft branded.
Sorry I updated that link, it should work: -clean-install-of-windows/microsoft-product-activation/phone-activation-windows-vista-7/If your wifes was an OptiPlex 760, Dell sold it with Windows 7 so the latest BIOS does have the markers for Windows 7 Dell OEM activation. The OptiPlex 745 and 755 do not similar to the Dimension E510.
At this stage the only important thing is getting the free upgrade to Windows 10. This can be done via the Windows 10 Insider 10130 .iso: -clean-install-of-windows/a-clean-install-of-windows-10/windows-xpvista-%e2%86%92-windows-10-free-upgrade/However you may need to find this .iso in an unofficial location as Microsoft no longer facilitate its download.
There are many ways through which you can activate your Windows Vista Ultimate, Win Vista home, Vista home premium, or Windows Vista business edition legally. This ultimate guide will help you to activate Windows vista legally with Vista genuine product key. 2b1af7f3a8