Unless a password’s been changed, it’s difficult for a typical user to tell if their computer or account is being hacked.
It’s very possible that your machine has become so infected that recovery really isn’t a possibility. If this is the case, the only practical solution is to wipe the slate clean and start over from scratch.
If your anti-malware tools removed the malware but this browser hijack keeps coming back, then you might be doing something to invite it back on to your system.
Windows certainly does support large drives, at the worst you may have to overcome some formatting issues.
It might be the website’s fault. It might be the browser’s fault. Either way, start by trying a different browser.
The problem is that some third-party download sites (not all) actually add software to your download. It could be possible that Norton is correctly preventing you from downloading viruses.
If you have a heavily used drive, make sure that it’s getting defragged on a regular basis. If it’s not getting used that heavily, there’s no harm in defragging it, but I wouldn’t go out of my way.
The tiled browser seems to be a different version of Internet Explorer. From what I can tell, it has reduced features and is less functional when compared with the normal Internet Explorer.