Mozilla Firefox will not open, and that's my main browser. All I get is a blank page. I'm running Windows 10, have run anti-virus, anti-spyware, and anti-malware. Nothing out of the ordinary from them. One thing I remember before this happened, was I had finished the AVG free trial and turned down the offer to subscribe, but I doubt AVG did something to cause this. PC is also experiencing a lot of lag. Thought maybe it was the modem, so had the cable company come out, and the modem is putting out a good, strong signal. Currently using Edge as a browser, as it will open, but it is slow, like I'm on dial-up. Problem is somewhere in the PC. Anyone have any ideas?