My pc has been happily chugging away for a while now, but in the last week or two it crashes when on firefox and other undemanding programs, and then it completely refuses to go to task manager, and then when I restart the pc it says there is an unexpected I/O error and I have to leave the pc off for a while for it to recover and let me boot into windows. Any ideas at all? Really don't want to reinstall windows. The computer has no problem at all with 100% CPU and GPU load with folding/gaming/whatever, but browsing is a nogo. And it's not just firefox, before you ask.
Thanks for any help.