A couple of things to try:
1. Use Task Manager to Identify the Cause of the Shutdown Behavior. Use Task Manager to determine the programs that are currently running on the computer. For each program that is listed in Task Manager, manually quit the program, and then shut down and restart the computer to test if the shutdown problem is resolved.
2. Undo Any Recent Changes to the Computer. If the shutdown behavior occurs immediately after you make a change to the computer (for example, you install or upgrade either a program, a service, or hardware that has device drivers), undo the last change that you made.
3. Use Safe Mode and Boot log* to Identify the Cause of the Shutdown Behavior. When you start your computer in safe mode, only a...