It's been three days so far! My computer's been slowed right down to near useless (half an hour just to log in). I freaked as I hadn't backed up in forever, so I spent the first day just trying to log in and back everything up on an external hard drive. At first it would often freeze on startup, so after battling forever, and having to uninstall drivers and reinstall (at those speeds) I finally managed to transfer everything. After that I tried a system restore from safe mode, but each time I tried, it would tell me it didn't succeed because a file (changed randomly) failed. I've defragged and even pulled the laptop apart and cleaned out the fan in case that was the issue (it had needed it for ages) after that it was much faster on startup, but avg keeps freezing at 27%, malwarebytes freezes about 3/4 of the way through, Chrome often won't open or freezes up when starting, Ctrl alt delete won't bring up task manager (but I can still get in by a start menu search) and probably unrelated... But the fn button also doesn't work. When I bring up the task manager, it says 80 processes are running, although only about a dozen are listed, and while cpu usage is 0%, the physical memory is around 40%. I have finally managed to access internet explorer and download avast, but now it seems to be hanging at 8%! Please help?!