I used to use Norton, back in the day when MS and Norton Both gave you control of your system and what you could do, Once MS and Norton started control freaking, I freaking left! I've tried AVG, didn't care for it, Kaspersky was too Klunksie, McAfee was just too .., MS SE well 'nough said, Never heard of Avira ora Eset so never tried 'em, besides once I tried Avast I haven't had problems, and, wait for it ..., wait for it ..., It's Free! And even IF it slowed down Boot Time, which I Haven't seen, That slow boot time is not an issue for me. Now if they could show a significant slow down in over all performance, then I might look at something else. But this works fine for me.