Hi Bill, thanks for your question. I'm Graeme, a Microsoft Community expert and fellow user.
AdChoices is adware that you can remove by using the below tools:
https://www.eset.com/us/home/online-scanner/
https://www.malwarebytes.com/adwcleaner/
You can try downloading and installing these anti-malware tools to scan and remove any malware that's installed on your system, such as AdChoices.
Please let me know if you need further support after trying this! Thanks!
Note: Non-Microsoft websites are linked. The pages appear to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.