How do I find which application I downloaded by date

Hi, I think I have downloaded something that is causing a problem. I have tried to resolve several problems and getting nowhere. It is very frustrating, so I need to resolve it and unload all that I have loaded in the last 24 hours. I think this would resolve the it. The system just gets stuck, it won’t respond, I have the feeling its something I have done. I really can’t remember what they were as it all becomes double-dutch language. I know it had something to do with ‘lib’ and I was slinging everything at getting Skype to work. All what I read the links did not resolve my problem. I loaded in WINE but I couldn’t get the webcam to work. The webcam software was rejected so I desperately went back to OS to get it resolved in anyway I could. Now I am paying for that

Try here