Useful Links
MalwareBytes: Free software to find and remove Malware (Adware and Spyware). Available at https://www.malwarebytes.com/.
AdwCleaner: Free software to find and remove Malware. It is particularly good at removing browser hijackers and unwanted browser extensions and/or toolbars Available at https://www.malwarebytes.com/adwcleaner/.
Windows 10 and Windows 11 have a free built-in Antivirus system (Windows Security), that is good enough for most people, but here are some other popular options:
Avast: Free Antivirus Software. Available from https://www.avast.com.
Other Antivirus Software: Norton, McAfee.
Adblocker: Adblock Plus, an internet add-on for Chrome, Firefox, and Edge to block (some) adverts.