Windows 10: Upgraded to W10, downgraded to W7 unconventionally, won't activate
I do not wish to go into detail regarding the illegal activation employed on your machine, I'd just mention that an OEM marker has been injected into the bios to spoof a Windows 7 OEM PC... you can check in the registry under HKEY_LOCAL_MACHINE\HARDWARE\ACPI\RSDT which OEM they copied.
MS has 'till now not found a way to counter this and thus Windows 10 cannot differentiate a genuine from an illegal version.
Since retail dvds are practically non-existent anymore, I would have to install a new OEM copy for myself. Will this overwrite the existing marker or would it add to it? Or would I have to remove the existing marker manually?
The marker on it's own is useless without a matching certificate and can be left there if you want... or a bios update from the motherboard's manufacturers website will remove it.
System builder keys, are OEM but are not the same as those employed by the large companies (which activate against the above combo offline )- i.e they activate online like retail - they carry a special EULA for personal use, however.
Could it be that the builder of this custom computer just recycled an OEM motherboard from a pre-manufactured computer and didn't actually mess with the bios?
Possibly, but they still need to find the correct certificate to activate it, which makes me think the install was a bit more deliberate.
slightly off center
You can still do a standard install of Windows 7, on a PC with an OEM marker, and not use the marker. You just use a Retail disk and type in your key manually. If it's a legitimate key it will activate online. Showkey will still show the marker as being there, it doesn't mean it was actually in use though. I'm just saying. It does sound like something isn't on the up and up, but hard to say 100% one way or the other. Now that being said, if it was an OEM-SLP install, and the key retrieved was the OEM-SLP key, that would explain why the new install won't activate. OEM-SLP keys are blocked from online activation. Like Superfly says, without the custom OEM install media and the matching certificate file, activation will fail. To reinstall Windows 7 with stock install media, you need the key from the COA sticker. If there is no sticker, that's another indication of a fake install. Just Google the last 5 digits of that key and you should know pretty quickly if its an OEM-SLP key.
slightly off center
It wouldn't happen to be > Home Premium = RHPQ2-RMFJH-74XYM-BH4JX-XM76F would it. If it is that key is almost certainly blacklisted by Microsoft.
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Hi, I have a notebook, a lenovo Y510P:
-Windows 8.1 x64
-nVIDIA GT 755M
-1TB HDD + 24GB SSD cache
-15.6" Full HD (1080x1920)
-JBL stereo speakers with Dolby Home Theater v4 (incredible sound, simply amazing)
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Last four digits are not my Windows 8.1 key?