How do I fix a "corrupt bios"?

[fwiesman]

If the computer is restarted or stopped, it is difficult to start. Once it starts if says the bios is corrupted and then says it will use the backup bios. Everything is ok until the computer is restarted or stopped. Then I have to go through the same effort to get it to start.

 

[C12Friedman]

I'll suggest checking that the CMOS battery is at 3v since one of it's main functions is to keep the BIOS settings while the computer is off.