PC Issue

My question is does anyone have any idea on how I can resolve my problem. The problem is one of office PC’s decided to go down on me where it would not do anything at all. I decided from there to clean the hard drive by formatting it, by doing so there is not OS installed. From there I restarted the PC, but after doing so the computer displays the “ERROR” Unable to control A20 line!” message when you start your computer, HIMEM.SYS did not load properly and therefore cannot make the extended memory or the high memory area (HMA) available.

Thanks,

Jose