Black Screen and Spinning Cursor after startup

When i turn my PC on, I get a black screen and a spinning cursor. I have turned my computer off and on over 20 times now. I have tried to uninstall latest quality update and latest feature update in advanced options but still doesn't work. I have tried system restore and thay didn't work either. I have enabled safe mode but I run into a blue screen saying we encountered a problem. Tried to go into BIOS but not sure what to do there. I am lost on what to try next. I did download the latest nvidias graphics card driver or something like that the night before and it was fine and then this morning when I opened my computer I now can't get in.