Bad starting bios checksum

Hello guys!
I have rpoblem with my PC - so when i start my PC after few minutes he crashes...or get autorestart and then crashes on restart...
I reinstaled my Win7 as i deleted and formatted my HDD , instaled all rpograms and updates carefuly ....But my problem didnt disappeared   .
After few restarts and crashes i got a message :
Bad starting BIOS checksum... Starting Bios recovery
and start to boot any divice to search BIOS recovery file.

If someone can help me ... thanks from now!

...and sorry for my bad language...

I appreciated your help!!