Boot problem

After doing a reinstall of W7, I discovered I had done something wrong. During the startup, my computer hangs up. Each time, I have to hit the F8 key until it gets to the choices. They are:
Floppy
CD
IDE
RAID VOL 0
RAID
RAID

I have to arrow down to RAID VOL 0. It defaults to Floppy.

My question is how do I change the default from Floppy to RAID VOL 0?

I hope someone can help with this.