On a rare occasion, you will find a PC entering Safe Mode on boot automatically on Windows 7. If this happens to you or on a Windows 7 PC that you maintain, please be sure to take a look at the ‘Power Settings’ (such as the hibernate mode) located in the Control Panel as it may need to be changed there.
The Power Options window which can be accessed from the Control Panel will let you know if the Windows 7 PC will be able to do a cold boot or go into a deep sleep (hibernate) instead. If the Windows 7 PC keeps going into hibernate mode, then it will always be awaken in Safe Mode once you boot it up. if the hibernate function will be useful to you, use the 4 second rule of holding down the power button to shut the PC off.
On the Boot tab on the System Configuration window, you will see if the Windows PC is set to Safe Boot. To get there, use the MSCONFIG command. If you find the box checked, uncheck it.