Tweed's method is theoretically correct. i.e. If you set the BIOS to use the CD drive as the first boot device then, assuming you've got the Windows disk in the drive, your system ought to go straight to the CD and start to install Windows. Experience has taught me, however, that this often doesn't work (which is why my previous instructions referred to booting from a floppy). [If you've got a pirated copy of Windows then Tweed's method almost certainly won't work because most pirated copies aren't made on bootable CDs. Not, of course, that I know anything about pirated software :-) ].
Try both methods. Hold down the 'delete' key while starting your computer to get into the BIOS. You might have to hunt around to find the relevant setting but just remember that, because you won't have the mouse available, everything is done by using the up/down arrow keys and/or the '+' and '-' keys, together with 'Enter' (to confirm entries) and 'Esc' (which always takes you back one stage). You'll also need to note which key (possibly F7) is used for 'Save & Exit' but this information should be at the bottom of the screen. Try setting the boot order to 'Floppy, Hard Drive, CD' and using the method I suggested before (i.e. re-start the computer while holding down F8 - if F8 doesn't work try 'Ctrl') or try setting the boot order to 'CD, Hard Drive, Floppy' and using Tweed's method.
Good luck!
Chris