Verify/Repair disk corruption- disk utility on OS X CD not working...

Hi Everyone....
I have an Intel-based iMac that was running on Leopard until a few days ago. My sister-in-law gave me her Snow Leopard upgrade disc, which I ran and successfully upgraded the machine to Snow Leopard.
Over the past few days I have noticed the machine running quite slow, so I ran Disk Utility-->Verify Disk, to which it said the drive was corrupted and needed the utility to run from the OS X disc. I don't have the original iMac discs, and the disc I used to upgrade the machine is no longer in my possession. I tried the OS X disc that came with my MBP, but it didn't work (being from a different machine).
Short of getting the upgrade disc back, any other ideas on how I can run the disc utility or get another set of original discs?
Thanks!

Jason Kichen wrote:
Short of getting the upgrade disc back, any other ideas ...
you could give [AppleJack|http://applejack.sourceforge.net> a shot.
Using AppleJack, you can repair your disk, repair permissions, validate the system's preference files, and get rid of possibly corrupted cache files. In most cases, these operations can help get your machine back on track. The important thing is that you don't need another startup disk with you. All you need to do is restart in Single User Mode (SUM), by holding down the command and s keys at startup, and then typing applejack, or applejack auto (which will run through all the tasks automatically), or applejack auto restart (which will also restart the computer automatically at the end of the process).
JGG

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Verify/Repair disk corruption- disk utility on OS X CD not working...

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