Can I restart install of OSX when half way through?

I started a reinstall of OSX Tiger on my old iMac with the intention of selling it on. I have installed Disc 1 without any problems, but when using install Disc 2 I am told there have been errors installing the software and to try installing again. I've tried cleaning the disc, which is admittedly a bit scratchy (as it was when I got it), but this had not had any effect.

I have a brand new iMac which I was hoping I could use to link to the old one to assist me in reinstalling its OSX, but that's way outside my knowledge sphere even if it's possible.

The only thing I can think of that might work is to buy a copy of the original install discs off ebay & hope the Disc 2 loads.

Anyone else have any suggestions?

Many thanks.