Is this a new system? You say you have not installed your drive yet. Does this mean your new system has NO hard drive in it?
An Operating System (Windows) must be installed on some storage medium that the computer can read and boot from and write to. The normal choice is on a hard drive. But on some special occasions you do boot from a CD in your optical drive. Follow these steps to get it set up.
1. Install the hard drive, including both power and data cable connections.
2. Install your optical drive unit, too.
3. Place your Windows Install CD in your optical drive.
4. Turn on and go immediately into BIOS Setup. This usually means you hold down the "Del" key while the system starts, until you see a screen that says BIOS Setup. A few systems use a different key to hold down, so watch the screen in case it tells you a special key to "Enter Setup".
5. On the first screen you should see notes that both those drive units are detected and identified.
6. Consult your system's instruction manual. Look for where in BIOS Setup you adjust the Boot Priority Sequence. Usually it's on a tab at the top to get there, then you scroll down to it. You should set it so that your OPTICAL drive is the very first device it tries to boot from, and the hard drive is the second one.
7. Once you have this set, use the screen prompts to find the key to Save and Exit. This will save your new settings and reboot. This is one of those special situations in which you WANT to boot from the CD in the optical drive - that is, the Windows Install disk - and that's why you set the sequence this way. In almost all future cases you will NOT put any CD in the optical drive, and the machine will try there first, fail, and jump immediately to the second boot device, your hard drive, and boot from there.
8. The machine will boot from the Windows Install disk and start the Install process by finding the hard drive. Note that it could not do this if you had not installed the hard drive already. Follow all the instructions and prompts for the Install.
9. When the entire Install process is over you will be told to remove the special Install disk and reboot.
10. With no CD in the optical drive, the machine will boot from your hard drive into Windows.