Houston we have a problem - can anyone help? Weve had a failed defrag...

Hi,
I have been experiencing a few issues with my macbook, so I popped it into disc utility to verify everything... it identified a few issues that it thought would be sorted if I booted from another drive.
So I booted from my external hard drive, got everything repaired and thought whilst I was there I would give it a defrag. This turned out to be a bad idea.
The defrag failed first time out, so trying not to panic I repaired and tried again and it said it had completed but also provided a device error.
Now the main hd wont load, I get the prohibition sign.
Ive tried booting from the DVD, this identifys the hd in disk utility, (although its greyed out) and allows me to verify and repair... So I try again... prohibition sign once more.
I booted from the DVD and tried to backup from timemachine, this appears to be fine but when I select the drive to backup to the hd doesnt appear...
I attempted a reinstall... but just cant see the hd to install too...
Im running out of ideas! Can anyone help?
Im happy enough to wipe it clean and just back up from time machine... how would i do this?

Hi Thanks,
Your right it wasnt discwarrior, apologies I think it was called disc magic or drive magic (I used my brothers external to boot from so dont know the actual name)it had a graphic of a spinning black disc on a brown (i think!) background with white text swirling around it... sorry to get so esoteric!
Im also unsure about the exact nature of the first failure... I know the defrag failed and it told me to repair the drive again which I did using discwarrior.
When I launch Disk Utility on the Install DVD, It appears that the hd is not mounted, so i assume thats why its unable to install to it, or restore via timemachine to it...
I have a windows 7 bootcamp partition on the drive which is working fine (its what Im working off now)
Hope this helps!

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