|Enter the bios setup routine. You should see what Key(s) to depress on one of the first screens. Then find the screen with the 'Boot sequence' and make sure that the CD drive is first.|
Then you should be able to boot the CD and get to the 'Recovery Console' where you can enter DOS commands. But I'm worried that you won't be able to fix your system that way.
If necessary, you can try a 'Repair Install'. But if the Registry is messed up, A 'Repair' might not work, or it might cause you to lose some of your data/programs.
How to do a 'Repair' install