Well I Never Mentioned Windows SYtem Resore, It is retard and stupid, All virus have a den in there. I have Rollback RX, it creates a linux ext based filesystem which windows virus doesn't detect, and thereon it couldn't affect it. System Snapshots are created often (depends upon your choice)......now you can play with your syetem. In case a virus comes in or you delete any important file.....just rollback, either partially or completely. This is similar to Virtual BOX's snapshot sytem, just difference is Rollback Rx works for real world.
And ultimately, even i have Malware bytes installed....gladly its free version doesn't offer real time security.
And those leak tests, I have spent my childhood playing with such sites and tests.......seriously, there is hell of a virus, a rare one that can break through any private commercial firewall. Comodo and Agnitum....I used them again, for 3-4 years, but then hey, I just prevente viruses at the cost of my own computer speed.
Now, Malware Defender, so advanced at things.....when they run it reports suspicious acts, just like a firewall but a firewall for everything from network to disk to syetem.
As In Ubuntu, in wine there is always an option to clear disk, and if you don wan't to....then ofcourse few like avast, clamav and bitdefender offer you on-demand scanner. But in no way, it affects Ubuntu, and in no way, it slows down no matter how many apps you load on to it, even if they are real time.
Ultimately, on windows.....avoid many real time processes, have one for all.....prefer schedulers, like having softwares to auto check for updates, turn it to schedule based, say every weekend at 12pm.....so this way you'll know what is happening, control everything by yourself and not leave it onto the windows OS. Linux, it is evergreen, shift onto it please.