PC just got super slow one day, and continues to be slow regardless of it being connected to the internet or not. I thought it was the memory as I had put in a used stick with the OEM to up the speed a couple years ago, so I bought 2 new sticks and same thing. Will be OK fast at startup then super slow. That is all the troubleshooting I've done thus far. I did not have any virus warnings or normal popups/adware like when I have been infected in the past. Can you advise where to go next? Thanks!