My computer has randomly started to move slow

[Lithium43]

Hello,
Recently while I was playing a game my computer has started to run slow. I was just playing GTA IV while it was running perfectly fine on my computer, and it starts to move slow. I exit, wait 5 mins, then try to play again. However, when try to start it up, it takes 5 minutes to get to the loading screen, and then it gets stuck there. So, I shut off my computer and wait 30 minutes. When I get back on I realize EVERYTHING moves slow. When I click a program or something it is slow to open, when I click search bars or anything, It sometimes move when I type, my games will take forever to open, EVERYTHING is slow. Everything was fine an hour ago, WHAT HAPPENED

 

[nedzad]

You have entered The Twilight Zone . No seriuosly it could be virus it could be your cpu overheating but i doubt that,HDD failing.Numerous things,but i bet there is something runing in background that uses alot of cpu power