Ken so do I. The bookie sites are probably some of the most secure sites out there, as you probably already know if you have ever got a password wrong. In the past I have used Norton, AVG, McAfee and others. All I found is that they caused conflict with, Defender, and slowed down the lappie in particular. Once I uninstalled them the pop up dire warnings, emails, and co-ordinated upgrades and scans that seemed to want to run every time Microsoft were doing upgrades stopped and it went back to being fast and uncluttered again. There is of course no substitute for common sense and bad websites will give you grief whatever you are using. Good strong passwords that have Capitol letters and numbers in them or even punctuation marks are the place to start. I cannot, hand on heart, say that you ought not have third party systems, I can however say that I would not go back to them on my desktop, lap top, or Surface Pro. I do run my Defender scans, and check daily for upgrades and always run them.