I am hoping someone can help, I upgraded to 8.1 last night and all was ok until I started my PC this morning.

The PC boots up and I can log in ok but I am unable to open any browsers, use the start bar or actually get in to most programs, use the search function or get in to any settings as it just hangs.

I can get to the start menu through charms and I can access My Pc from there but opening control panel hangs as well. I am also unable to get to the troubleshooting and repair.

I have tried to restart and press and hold the shift key but it just hangs again when restarting, also tried to log out of my profile but that also hangs.

I have tried to boot from a USB with a windows 8 ISO to get in to the repair from there but that doesn't seem to work - Also the windows product key shows as 'not available' ??

Does anyone have any ideas on how to actually do anything with my now expensive paperweight that has a pretty but non-functioning desktop screen ?