George, Many times the browser holds on to cookies, history which you can cleanup. Internet Explorer it is under tools\Options Chrome right corner tab history. Clear cookies, history from the beginning of time. Trying a different browser will tell you if it is an add-on or cache stored in the browser. If you have not tried a different browser then download one and see if that makes a difference.
Malware Bytes like many others has a problem with Windows 10 updates. Most of the Anti-Virus and firewall products do not keep up with the operating system changes in Windows 10 when they rework the OS to the next level. I was running Zone Alarm free firewall until it could not keep up with the changes. There is a lag where they are goofy until the updates to the protection software catches up until then you get false warnings. If you run Microsoft Defender and MS firewall only you will not have that problem. Keep anything important on an external USB HD and keep it unplugged between backups. I hope this helps.
Malware Bytes like many others has a problem with Windows 10 updates. Most of the Anti-Virus and firewall products do not keep up with the operating system changes in Windows 10 when they rework the OS to the next level. I was running Zone Alarm free firewall until it could not keep up with the changes. There is a lag where they are goofy until the updates to the protection software catches up until then you get false warnings. If you run Microsoft Defender and MS firewall only you will not have that problem. Keep anything important on an external USB HD and keep it unplugged between backups. I hope this helps.