I have a Lenovo laptop 8gb...everything was perfect, till I clicked on update to windows 8.1...now it's not working just flashing up saying ' your PC ran into problems we need to restart and collecting error codes then we will restart for you' it keeps going to the Lenovo logo and then back to the message...I have done the obvious switched off and on ....nothing...please help I have no idea what to do...it's brand new also I'm gutted