I have a toshiba c55 laptop with windows 8.1 and after a recent update the Function keys appear to be reversed. In the past I would press the volume up button and the volume would increase, but now I have to hold the FN key to do so. It only seems to be getting worse with time... now when I press the i key while using Firefox the screen toggles to fullscreen mode, but the i key is still printed out. I have tried switching from special to standard function mode and vice versa from the BIOS, but nothing has worked. I tried system restore, but that has only made it worse. After the restore all the same problems were still in effect, but now when using firefox if I press the o key it brings up the web developer window. Any ideas?