I'm a true idiot. Let's get that out of the way. I really messed up with my computer security and there's no other way of putting it than to say that I'm a true idiot.
Putting aside my stupid actions, which I will describe below, I wish to ask knowledgeable and trained people for help in securing my home network, computers, and devices and have a slew of questions I'd like to ask on the topic and my specific situation generally. This is going to be kind of long, so I hope you'll be patient with me and realize I really do badly need help.
BACKGROUND INFO. A: I live at home with my parents and younger sister. We have Verizon Fios internet. My sister and I both own HP laptops. My parents own an iPAD. Parents don't have anti-virus (b/c they think you don't need it for Apple products), but my sister and I do.
A couple of months ago, I visited a porn site that's been known to be a cesspool of malware infected videos. I am a true idiot. Very shortly after visiting that website, my computer started running more slowly. It started off with minor decreases in speed to being totally inoperable practically. Like if I started it up right now and tried to watch a YouTube video, it would probably take 5-8 minutes (minimum) to load a video, whereas before my porn site visit a YouTube video would load and start playing at normal speed within seconds. And if I tried to play a 10 minute video, it would likely take 20-30 minutes (minimum) to fully play through the entire thing with frequent pauses throughout. Web surfing also takes forever to load pages.
Additionally, I've noticed weird stuff at the bottom left corner of my Chrome browser that wasn't there before. Every time I go to a new webpage, it will say "waiting for ______________" and list any number of weird names that aren't the target website. Often there will be 5 or more weird names that are toggled through.
Shortly after I noticed my computer slowing down, my sister's and parent's computers also had the same issue. My parent's iPAD doesn't seem to show as much decrease in speed, but there is noticeable decrease. My sister's laptop also has shown speed issues, although maybe not as bad as mine. Also, her email keeps sending out junk mail to people (me and others have noticed it and told her about it).
BACKGROUND INFO. B: My porn site visit took place in August. However, prior to that back in May, we had a power outage that caused our Verizon Fios router to reset to factory default settings. That meant it went back to a generic login name and password (that I've been told is easily searchable and cracked). Being the ultimate idiot, I did not change the settings after the outage to a more secure and personalized login name and password.
I literally only did so a few days ago after it was clear my laptop had a virus/trojan/hacker or whatever.
Therefore, anyone could have potentially hacked our network from May until late September. And remember that I also visited that porn site in August.
Why did I not change the Verizon Fios router default settings to a personalized one after the outage? I literally forgot and no one else in my family is very computer literate either. I'm the only one who knew to change things in the first place. I just gave my parents and sister the default factory settings name and password like a true idiot!
PROBLEM: Obviously, something is wrong with our computers in our house. They are slowed down and mine is super freaking slow.
I fear we may have been hacked via our router and/or had a virus/malware spread from my computer to the others, due to an infection from that porn site.