Did I kill my iMac trying to uninstall Quicktime?

Yikes.
Since I couldn't find a way to downgrade from Quicktime 7.3 to 7.2 -- I'd called Applecare and checked all over the internet -- and had concluded from anecdotal evidence that 7.3 was making the video component of my iChats not work -- I decided to manually Trash every file listed as being part of the 7.3 update. MISTAKE #1
After that, no applications would open. I could move my mouse around the screen, but nothing "worked".
Instead of getting all the files I'd move out of the trash and back into place, I decided to restart the computer. MISTAKE #2
The screen starts up, but cannot get past the blue screen and final blue "progress bar".
I was prepared to reinstall all the system software, but first thought I could maybe fix my damage. So I kinda shoved in the Tech Tools CD that comes with Applecare and restarted holding down the 'C' key.
I've tried restarting holding down pretty much every key, but it won't boot from the CD. It just hangs still on the blue progress bar.
So now I have an unbootable computer AND a full CD drive.
What can I do ???

Probably the easiest way to recover from this would be to put your system DVD in and restart holding down the "C" key so that it boots from the DVD. From there you can choose to do an *archive and install* which will put a new system on your drive without touching any of your personal settings or applications. You will be left with a folder titled "previous system" and if there is anything you need you can move it out of there. Once everything is working and you are certain that you have all of your data you can trash the previous system folder. This will put whatever version of Quicktime shipped with your system back on the drive and then you can decide whether to update it again or not.

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