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Hi there and welcome
It appears he made it your background picture.
Right click on the desktop in a blank space and choose Personalize
Click on Desktop Background and you can change it there to what you wish it to be.
I can also do these steps for you, and have made a request via Additional Services. This is optional, and if you choose to do this, I can, with your permission, remote into your computer while you watch and do all these steps (and deal with any problems that arise during them) for you. Or if you do not choose to take this service, we can continue here. This is no problem at all. Just let me know please.
Else let me know the results please.