Store Left the RetailAdmin on Open Box Item

[DBPbear]

I bought an Open Box HP ENVY 31" All in One Computer last week, but when I got it home it still had a Best Buy "RetailAdmin" login as the Systems Administrator. I was able to add my own logIn ID, but discovered that there was hardly anything I could do without being the Systems Administrator. The system boots up, but now I can't even login to Windows anymore since my personal login ID password no longer works. 

I went back to Best Buy to find out how to fix it and they told me that I needed to bring the computer in. That would be a major problem in that I'm 78 years old and the computer weighs 44 lbs. I had to hire someone to carry it up to my apartment -- so the added cost and inconvenience of getting it there and back is something that I definitely don't want to do.

I asked if I doing a clean install of Windows 10 Pro would solve the problem and was told 'maybe.' I purchased the software and discovered I couldn't install it without logging in to the previously installed Windows 10 Home edition. Since I can't get past the logon screen, the computer is now completely non functional. Is there a way I can get around this by reformatting the computer and then trying to install Windows 10 Pro? Or am I going to have to hire someone to take my computer back to Best Buy for them to fix there?

I bought an HP ENVY 31" All in One Computer last week --Open Box, but when I got it home it is unfunctional because it still has the RetailAdmin password required to log in. How do I get around it?

I talked to someone from the Geek Squad and asked if I did an upgrade to Windows 10 Pro would that solve the problem. He wasn't sure. So I spent another $217 only to discover that I can't even install that.

I was able at one point to reset to factory settings and enter a new Systems Administrator password, but when the Login screen appears it still wants the RetailAdmin password.

[Prométhée]

Hello

[start]
This is an automatic response
in order to avoid writing the same thing each time

Some elements may therefore not apply to you 
To be able to answer you effectively, we need some information

we need the exact model of your computer, and the product number
To find it follow this
for a desktop computer

HP Desktop PCs - How Do I Find My Model Number or Product Number? | HP® Customer Support
and for a laptop
HP Notebook PCs - How Do I Find My Product Name or Number? | HP® Customer Support

Give the full name with the product number P / N

this is not a model:
HP Desktop M01-F1xxx
the requested product number must look like this
Product Number: 9EE50AA # ABA
the model corresponding to this number will therefore be
HP Desktop - M01-F1033wb

Give the full version of windows

for windows 10 type winver in the search box
if you give the best information
your problem could have a solution more quickly (depending on the difficulty, of course)
Learn how to use the Community

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[DBPbear]

HP ENVY All in One 32-a0014

Product Number: 6YR45AA-ABA

Windows 10 Home Edition

[Prométhée]

Try by checking the following links if you can reconfigure the computer to factory mode
There may be different options, depending on the model, but hp doesn't always tell you the exact solution.
Sometimes some options are therefore not available
Once the recovery is done, you will be able to see for the pro version if you absolutely want to install it

 Reset the computer

Or check and tri

https://support.hp.com/us-en/document/c06162205