Cannot recover data after re-install

Hello,

I have an iMac that was running Leopard.

It has been running a bit slow so I thought I would re-install leopard again from the install DVD that came with my iMac.

Currently I had 2 partitions one for 'bootcamp' and the other 'Macintosh'. The iMac came installed on Macintosh.

I am not expert on iMac as this is my first time. So when I it came to choosing a partition to install on I selected the bootcamp so I wouldn't have to erase my data on the Macintosh partition.

I thought I could mount the Macintosh and then get my important files after the installation completes.

The installation completed without any problems.

However, when I go to disk utility and try and mount Macintosh I get the following:

Code:

The disk “Macintosh HD” could not be mounted.
Try running First Aid on the disk and then retry mounting.

I tried running First Aid and got the following:

Code:

Invalid number of allocation blocks
Volume check failed.
Error: Filesystem verify or repair failed.

Is there anything I can do?

Many thanks for any suggestions,