when the computer is on and you let ti ''boot'' as far as it will go just pull the plug to kill it count to 5 and plug it back in and restart and you should go to a dos like screen that offers that option
should be a screen like this from the first screenshot used here
http://superuser.com/questions/462597/why-isnt-my-windows-7-x64-laptop-hibernating-properly
choose safe mode
if not then you may have a deeper issue
thing is I gave you something to try , nothing on doing any of that to see
he asked for your system specs so maybe we can dig around on known issues or a more direct help / work a round . nothing on that yet ??????