I applied instructions for creating exclusions in each program for the other. I Googled "compatibility of malwarebytes and kaspersky Internet Security" but I don't remember the exact pages that contained the instructions.
See this, some cases MBAM can play well with other security suites, but really did not need buy premium of Malwarebytes as it is good enough to run it just using a scan when having another AV
https://forums.malwarebytes.org/ind...premium-and-kaspersky-internet-security-2015/
My Firefox has extension Noscript installed. I stopped a lot of adds by blocking specific items that Noscript shows -- whose names indicated that they are commercial. But that is treating the symtom instead of the disease.
The nature and extent of symptoms seems to depend on 1) what website I am on at the time, 2) on which of my user accounts I am using, and 3) on which browser I am using.
Links don't always lead to where they are supposed to. Using Firefox, one link on a sevenforums page went to a page that kills Firefox when that new tab is selected. I couldn't copy the page's url because that makes Firefox unresponsive. The page only had script on it and the address contained Cts.AdsSend.net. This was repeatable several times.
Then with Google I found the page
Remove Cts.AdsSend.net pop-up ads (Virus Removal Guide). IE could read thst page but it would make Firefox unresponsive. That was repeatable at that time.
But today I discovered that the results depend on which user account I am using. I might have been using a different user account. In one user account, both Firefox and IE can display the page OK. In a second account Firefox is OK but IE freezes when I try to close the browser while the tab containing the page is open. This seems to be repeatable.
Another problem with this computer that I haven't thought of as virus-related before is that HP Support Assistant stopped working and HP support hasn't been able to fix it.