New
#1
After Running AVG and Avast!, Really Bad Lag
I had accidentally installed something with a virus, so I brought my computer to a repair shop. They never went inside the computer or anything, but they installed and ran AVG, and after that they ran Avast!, after Avast! they ran Malwarebytes, and then they ran CCleaner. They also uninstalled all of them after they finished, but left on extensions such as Web of Trust, Disconnect and Ad Blocker. Now, my computer is super slow when doing basic tasks such as YouTube -- which it never has had any problem running over 100 tabs and playing like 10 of them! YouTube stutters and freezes and repeats audio or frames, and it's really scary (sometimes earbleedingly loud) and annoying. My computer has nothing taking up 99% of RAM or Disk, CPU, or Network.
To add on, now, when I download a game from Steam, my entire computer has system-wide lag of my mouse and the entire computer and I can't even voice chat without earbleeding audio that freezes and repeats so much that it actually scares me. My computer takes a few extra seconds to load anything, and anything that installs something will give me massive lag even if it's not intensive.
My computer has never ever ever had any of these problems and I don't really know what happened to cause it, but it is now incredibly slow. Can anyone recommend me anything I can do to speed it up? It is very annoying and scary and I have no idea what's wrong with it. It isn't malware or a virus, so I think this goes in this section though I may be wrong. My apologies if so. Thank you for any help.