When you first start up, will it boot into a window's safe mode? Usually pressing an Fx key like F8 will give you the option to boot in the safe mode. Here are some options: http://www.howtogeek.com/107511/how-to-boot-into-safe-mode-on-windows-8-the-easy-way/
If the laptop has a actual hard drive (not an SSD) a head crash may have happen due to the sudden shock since the computer was running at the time. Only replacing the HD would fix that.
A second possibility, if Windows won't boot, is that memory became dislodged. If you have access to your memory sims (usually under a removable cover) check to see if they are seated properly.