Cannot enter Bios after installing Windows 7 build 7057

After I installed WINDOWS SEVEN Build 7057, I can not enter the BIOS.
This is my desktop PC. In case, with XP or Vista, I press "del" repeated twice and enter the BIOS. Have not succeeded in this with WIN SEVEN and not with some other keys (Fx), either. Someone with knowledge that can help me.

We had the same problem with a desktop computer at work. I think they cleared the CMOS to fix it. Alternatively, you can change the battery that is in the motherboard.

Thank you Frenzy!
Shall try your tips tomorrow.