Whenever anyone receives a previously used computer, the first thing to do is to erase the hard drive and reinstall all the software. That's the only way to be 100% certain that the computer is free of configuration mistakes and malware - and you want to be 100% certain - and it's the only way to ensure that the computer is setup the way you like it to be.
CAVEAT: If BitLocker was enabled on your Aunt's computer, and you don't have the recovery key, you might not be able to do this. If the computer was used in an organization, BitLocker might have been implemented in a way that makes it impossible to erase the hard drive.
There are two ways to erase the hard drive and reinstall all the software: the easy way and the hard way. I'm lazy as all get out, so I like the easy way.
EASY WAY: Computers from the big name manufacturers (Lenovo, Dell, HP, etc.) are delivered with a special hard drive partition that contains all the software that was installed at the factory. With a few keystrokes, you can replace what's on the hard drive now with the software that was installed at the factory. It's what you get when you press the Power button for the first time on a new computer.
The hard way takes longer, but in return you have more control over the outcome.
HARD WAY: You'll use Microsoft's own Media Creation Tool to create a generic Windows 11 installer on a USB flash drive. Boot the computer from the flash driver and Windows will commence installing.
It's completely up to you which way to go. Instructions for the Easy Way are on the computer manufacturer's own website. The procedure is so quick that I could summarize it right here, except that individual manufacturers might have slightly different procedures. Instructions for the Hard Way are much too lengthy to completely describe in a community forum post. Essential instructions are on Microsoft's website, but the internet has more details and some good advice, too. (Like: Don't do what I did.)