Windows 10: I purchased a Dell desktop at auction with windows 10 installed. Can I remove old accounts...

Inspiration 36682017 was the date of manufactureThe Windows OS was usually an OEM My guess is that it is Windows 10 - No OS tag on the machineI do not have the original disksI do not know the previous owners passwordI have re-registered the machine in my name with Dell.

:)

 

Windows install on a laptop bought at Auction?

I bought 3 identical Dell Latitude laptops from a Police/Airport 'lost and found' auction. All had their drives removed. All had Windows 8 Pro stickers on the underside:

I used the MS Media Creation tool to install Windows 10 Pro offline (i.e. not connected to the internet) so I could use a local account, not a Microsoft Account. All picked up the Windows 8 key stored in the BIOS/UEFI and activated Windows 10 automatically the first time they connected to the internet. Example from Dell BIOS/UEFI of Windows 8 Pro product key embedded in BIOS/UEFI (Many thanks @SIW2 for the very useful link.)

Hope this helps...

 

Remove account

I suggest you backup your personalized files first before removing the account.
To delete an account, follow these steps:

1. Press WIN + X keys and click Command Prompt (Admin) from the menu.
2. Type the following command and press Enter. Replace test with the name of your sister's account. Code:

 

Installing Windows 10 using Windows 7 key

Nope, you need to install Windows 10 first and make sure the Windows 7 key is transferred to your Windows account after you've installed Windows 10 (not quite sure how that works). I missed the last step and I could not activate Windows 10 after a re-install... Microsoft seem to have done everything they can to make it a PITA. Also, it's technically too late to do this now anyhow, as the upgrade offer has expired. But KMSPico works quite well...

As for getting rid of Windows, delete the Windows folder.