FWIW: I run Win 7 and Win 10 on a dual-boot...have done so for several years now, with no problems.
I run the Win 10 Windows protection sans any other "protective services" because I believe it quite capable of doing the job. No 3d-party "privacy, etc." software...just Windows Update and the native W10 system security protocols.
Win 7 is a bit trickier...it's unsupported/outdated...and many vendors do not produce effective software addressing the state of Win 7 in today's threat environment. This is understandable, IMO. Net effect is that I ignore Windows Update based on the principle that the system is just going through programmed steps which are not current with the threat environment. I have a subscription to Malwarebytes Premium, which I use as part of my baseline protection. That's it. Periodically, I will run Adware Cleaner as an exercise when the impulse hits me.
https://forums.malwarebytes.com/topic/191650-malwarebytes-3-frequently-asked-questions/#comment-1311691
Others here will have varying or different opinions/experiences but I intend to roll with Win 7 and Win 10 until I discover some cogent reason to panic or change my attitude toward using it.
Louis
I haven't had an infection/penetration problem of any sort that merits my attention...I believe that is partly due to the premise that Win 7 systems would not reflect the current interests of those intent upon creating chaos for system users.