How to delete RAV Antivirus on my Windows 10

Solution 1:

A regular antivirus ought be be able to remove it - get one you've heard of at least - see https://file-intelligence.comodo.com/windows-process-virus-malware/exe/rav who have a freeware remover.

If you can't get anything to install on the computer, you might have to pull out the drive & do this from another machine.

…and in future read all dialogs when you're installing things. RAV gets onto computers because the user actually allowed it. It's not technically malware itself, it's just a useless PoS designed to make you think everything's infected, so you'll buy it. It's sometimes masked in malware too. You may have got the latter.

Else see How can I remove malicious spyware, malware, adware, viruses, trojans or rootkits from my PC?