BIOS

...is the basic input/output system that looks like a blue screen with white text which allows one to do some rudimentary stuff before the operating system starts to run. If you want to boot from the CD/DVD drive instead of the C drive, you may set that, etc. When you are first boot up, you will see white text scroll on a black background as the box tries to find the operating system and you'll need to hit a hotkey in this window of time before you see that familiar four panel flag of Microsoft Windows in order to break into BIOS and this suggests the common modern day hotkeys for this are: F1, F2, F10, Delete, and Esc ...any one of these should do