Hi moneyy12345!
Don't panic, you do not have to buy 2 disks.
You can get into the BIOS by tapping F2, or Del, during start-up.
You'll be able to turn Secondary Master to None there, although I don't think that's necessary.
How is your harddrive connected to your mainboard?
Are the jumpers set proper?
If you don't understand what I'm saying, post back
Blue