Never fear smoke and flames, we understand what you are saying. Lets look at the facts:
1. Your CD Drive is external and connects via USB.
2. You do not have the option to select the CDROM in the boot priority.
3. You cannot load Windows without first booting from CDROM.
This is what we need to find out:
1. Does the PC detect that there is a USB CDROM drive connected at boot up?
- If not, enable the USB function in the BIOS.
2. Can the BIOS be changed to enable the PC to be boot from USB devices?
*** To answer question 1, when you boot your PC, there should be a list of all the hard drives connected to the motherboard. The CDROM drive should appear in that list. If it does not, there should be an option to enable USB devices in the BIOS.
*** To answer question 2, go into the BIOS and look for an entry which is along the lines of "Boot from USB", or anything to do with enabling the PC to boot from USB devices. Ensure this is enabled.
Now, if you were able to anwser those two questions, you will need to reboot your PC, and after the POST (at which time it should also detect your HDD and your CDROM drive), go into your BIOS:
- Does it now give you the option of selecting your CDROM drive in the boot priority list?
If so, ensure that the CDROM is first in the list, then save your changes and reboot. You will need to keep your eyes on the screen because it will ask you if you wish to boot from the CD (ie. press any key to boot from CD).
If not

, you will need to find a friend who can make you a floppy boot disk that will enable both CDROM and USB support, and then launch the Windows Setup disc from the MS-DOS prompt.
Let us know how you get on with those options.......