After i restart my computer how do i get it so that when it turns back on it goes into the screen that lets me decide if i want to boot from cd or boot regularly?
nickc's advice is spot on. That option only works (for a few seconds) when your BIOS is set to start from CD first.
Read the friendly manual that came with your motherboard. Also, immediately after starting the PC, you should see a message to press (usually) the Del key to go into BIOS. Being as inexperienced as you seem to be, I would advise to ask for assistance from someone more knowledgeable. Messing with the BIOS is not for the faint-hearted.
leave BIOS updates for experienced computer programmers and technicians. screwing up a BIOS will render your PC useless.