ESET AV Remover was designed to remove any existing antivirus programs that were installed on your computer before you install ESET.
Of course, you can always use the Programs section of your Control Panel, or an application like IOBit Uninstaller.
While ESET AV Remover was designed for getting ready to install ESET, it will work for any antivirus programs.
You will need to restart your computer once you're finished so be sure to complete your work and save all relevant data before launching ESET AV Remover.
Other apps already exist that can do this including IObit, Revo, and Wise. We recommend using one of those unless ESET support asked you to use this. Finally, ESET AV Remover is one of those tools most techs will want on hand for that one time you need it.