How to fix computer problem?

So after my computer automatically updated to windows 8.1, I had the following noticeable problems:
Pages/websites on google chrome sometimes don't load, or load weirdly
Low memory problems/crashing on League of legends (never happened before)
Pure virutal function call on Minecraft (never had problem before)
Computer randomly has spikes of making loud noises (like the sound your computer makes when you run intense stuff), when I just have one tab open on chrome (when I check task manager when this happens, memory and disk are fine, but CPU level spikes up and down.

Does anyone have a fix to this problem? I honestly don't think that my computer/memory is in bad shape right now. Either, I'm pretty sure it was the 8.1 windows update that screwed my computer up (it screwed up my mom's computer as well 6 months ago), or its some process in the long list of processes in task manager. I have 6 RAM with 5.89 available, and like around 620 free disk space out of about 675. Even my computer geek friend said that my computer is pretty okay, and shouldn't have problems.

Just a guess, but it maybe that google chrome is fighting with the old software that you may be using to block spyware. So, how many spywares do you have running? Only one is needed, sometimes google chrome gets into fights with other software already installed on the computer. Try checking into what is not compatible on your computer and I think it (what ever software it is) will need to be replaced. I would just get google chrome OFF MY COMPUTER, but that is just me. KEEP THE LOVE ALIVE said secondson2002