Allright, during booting you see a black screen with white letters on it, the screen where also the text'overclocking failed' is shown.
Usually at the bottom of the screen, or the right side, a text is shown similar to this 'press
key to enter bios/setup)
Press this key and you'll enter the bios. Depending on your bioschip you get a menu with one of the options being 'load default settings'/'load fail-safe settings' or you can read (at the bottom) 'press
key to load default settings'. This way you can load these settings, loading the default settings should suffice, but if you keep getting errors, load the fail-safe settings. After loading them choose save settings and exit.
Now your computer will reboot and the error will not show up. If you experience problems configuring the bios please post which motherboard you have, manufacturer and/or type. When you don't know you can download
everest home which will tell you which motherboard you have.
good luck