Please help! my iMac keeps freezing, mouse and keyboard do not work after

Early this morning I turned on my iMac and started downloading updates through software update as usual. I was browsing a website in Safari when all of a sudden the "zoom" feature activated itself and I could not turn it off. I restarted and the keyboard started typing different characters but not letters, so I took out my installation CD and it took me quite a while to reboot the computer using the CD as a startup. Since the keyboard had a different input, the C key was not running the CD. I tried loggin into the support page, but it downloaded the links into the desktop. I used system utilities to restart the computer from the CD, I verified the Disk Permissions, then Repaired the permisions, then the Verify Disk and then the Repair disk, in that order. I restarted the computer and everything seemed fine, but after a couple of minutes the mouse starts closing windows, downloading website links into the desktop and then the keyboard freezes and does not let me type! This has repeated over and over, and I don't know what to do!
Posting this message has been quite an achievement, because I have restarted the computer a lot of times in order to finish.
Someone please help! I don't know what else to do!!!
Thanks!

Yes. And since you aren't backed up, you may have to use Prosoft Data Rescue to try to recovery any information that is critical. First though, do you have another Mac you can hook this one up to using Target Disk Mode?
If you do, that's another way to rescue information. Target Disk Mode is explained here:
http://docs.info.apple.com/article.html?artnum=58583
Similarly, if you have a bootable external hard drive, you can try to boot off that with the Startup manager:
http://docs.info.apple.com/article.html?artnum=106178
To rescue your information. This at least will allow you to do further analysis to see what data corruption might have happened. If the drive is invisible when booted off another, that may indicate a directory issue. But first let's see if we can attach or boot off another and see the internal drive of the machine.

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