Windows 7 boot mechanism is made up of the Windows boot manager (Bootmgr.exe), Windows operating system loader (Winload.exe) and Windows resume loader (Winresume.exe).
The boot configuration is stored in the BCD store and the Bcdedit tool provides a common interface for managing boot options. You must be a local administrator in order to perform configuration changes to your boot options.
- From the command prompt – (Start menu Search box type cmd and click the cmd icon on top)
- Type bcdedit /? to list the help for this utility.
For example the option bcdedit /set vga on, would load windows with a low resoltion VGA display driver on reboot.