Enter the following command and press Enter: Msconfig.
If you have only one entry invalid in boot manager,
it can simply delete Msconfig.
This includes, the desktop, start menu, task bar, processes list,
Control panel programs and Msconfig startup list.
Use Msconfig to determine what programs and services
start at boot(or startup under task manager in Windows 8).
And when it's done with your business in the Safe Mode,
simply go back to Msconfig, and uncheck Safe Boot.
This means regularly running a scan for malware, cleaning your hard drive(using cleanmgr and sfc/scannow), uninstalling programs that you no longer need and
checking for Autostart programs(using Msconfig).
If you just enter this, Windows won't find anything,
and you will get the“‘Msconfig‘ is not recognized as an internal or external command,
operable program or batch file” error message.
After you install Windows, a few days, and he gave errors and allowed him to enter the Task Manager, Services,
RegEdit, Msconfig etc.(Keep safe on the HDD
and return to the new installation of Windows).