MBR ERROR1 at startup

Hello, I am experiencing a startup issue with my new computer a
week after purchasing it.
When I turn it on, it displays: MBR ERROR1 Press any key to boot from floppy...
Every time I press a key, it shows the same message.
So I ended up pressing ctrl+Alt+Del
An image of my motherboard appears and it says below: please press DEL
to enter EFI Bios setting.
I then press the delete key or else the screen shows MBR ERROR1 again.
I then see the CPU temperature... and at the bottom the Boot sequence which is:
1- my CDDVDW drive
2- Intel RAID5
3- Generic STORAGE DEVICE 9451 (I don’t know what this is)

I press the F8 key (boot)
A small window opens (boot menu), 6 lines:
-CDDVDRW
-intel RAID5
-Samsung HD204ui
-Samsung HD103si
-OCZ-vertex3
-Generic storage Device9451

I believe I have tried all possible combinations (between the boot sequences and the 6 lines in the small window), and the only way for my computer to start normally is to click on OCZ-vertex3 in the small window.
The problem is that I have to repeat the same steps every time I start the computer.
Thank you for your help.
Greg.

Configuration: Motherboard ASUS P8p67 LE
Processor i5-2300 2.8GHz
Graphics card SAPPHIRE ATI RADEON HD6870
Hard drive OCZ vertex3 60Go
3 SAMSUNG Spinpoint F3 1To hard drives
2x4Go DDR3 memory
Windows 7 Home