A long time ago (when i was like 13-14) Id get a stuff ton of viruses on my computer, mainly because it was when i started to try and find research sites and going to some VERY sketchy places.
Got a stuff ton of trojans and stuff from that. Didn't know how to fix it and my computer was already bad because a thunderstorm made it extremely hard to turn on, so I said "forget it" and shorted out the computer so my mom wouldnt know.
Same thing happened later by accident, though i actually knew how to get rid of it (kinda)
It stopped me from doing a system restore or opening up my task manager so I had to start it up in safe mode and i did a factory reset. Not like it mattered since it was a hand me down from my grandparents and it was already slow as is. Could barely go on chrome.
On my laptop i had some issues, though i don't know if it was a virus or just my computer messing up, but a very important program was deleted on my computer I think and so the computer took forever to turn on and when you logged in it would take forever to do anything. Soon it wouldn't even go into the login menu, so we had to do a reset on it and it worked perfect after that.
On my current computer I have been a LOT smarted and haven't gotten anything yet. I guess having all these mess ups actually helped me.