As of November 20th 2021, Sophos has discontinued support for their free Home product. If you have this installed and have not upgraded your license your computer will be unprotected. More information on the change and how to upgrade can be found Here.
If you do not wish to continue using this Sophos Home product, follow the instructions provided by Sophos for Windows 7/8/10 or MacOS X/11/12 to uninstall the program.
Note: Permanently deleting files generally requires overwriting the disk location 35 times and takes quite a bit of time.