The @ key is most likely your PC is setup with an American keyboard, you can go into the control panel the region/language and change it

The browser showing you your favourites but nothing else could be the page is cached so it's not necerrily the current web page, the cannot connect thing could be 100 different things, try restarting the router, give it a couple of minutes then restart the PC, it could be a virus/malware, get somone to put a copy of "malware bytes" on a CD/memory stock for you and install it then do a full scan of the PC