Hard Disk Recovery
should be enabled by default. If it is not, you may need to go into your system’s BIOS by hitting F2 at boot and enable it under the Advanced tab.
Once Hard Disk Recovery is enabled, restart the system and hit ALT+F10. This will begin the system recovery process. You will be prompted to type six zeros as a security step. Type 000000 to proceed.
This will format and reinstall the OS and all original programs just as it was brand new.