Do you have more than one operating system in your system? Do you have to select the operating system every time you run your system? You can select the default operating system if you have dual-boot in windows.
Right click on “My Computer” icon from the desktop. Now you will get the following screen.
Now put a tick mark in front of the check box “Time to display list of operating system” and make it as “0” so that you don’t have to wait to start the operating system.
Then click on “OK”
Then again on “Apply” and “OK“.
Now you have selected the default operating system.