Hi J Keenagh , windealist is an adware which you should be able to remove following this removal guide - https://www.pcrisk.com/removal-guides/7830-windealist-virus

If you can't uninstall windealist using Control Panel you could try using third party tools to assist you in this task:

CCleaner
Download, install and run CCleaner. After launching the program select "Tools". In the uninstall programs list select the program you want to uninstall and click the "Run Uninstaller" button.

Revo Uninstaller
Download, install and run Revo Uninstaller. After launching the program select the program you want to uninstall from the list and click on the "uninstall" button.

IObit uninstaller
Download, install and run IObit Uninstaller. After launching the program select the program you want to uninstall from the list and click on the "uninstall" button.

After uninstalling windealist and eliminating it's browser plugins from your Internet browsers (Internet Explorer and Mozilla Firefox) you should also scan your computer with Malwarebytes Antimalware and Spyhunter, both of these programs are capable of detecting and removing windealist adware.