IMac i5 as slow as can be and then some

Got an i5, had it two weeks, works fine (2nd one) no worries, had a software issue, couldn't find a file to delete and so on.
So, today I decided enough was enough and to erase the drive and reinstall Snow Leopard from the Apple disc that came with the i5 30 mins later and was back to being able to use it...
BUT and it's a big but the machine is now uber slow, it's connection to the net is slow, I cant read from the cd drive very well as in it sees the discs but installing a program is almost an impossibility simply because the drive takes a while to access and so on.
Any ideas because frankly as it is it's an unusable machine and all I've done is erase and start again and as I'm typing this I'm downloading the updates (6 of) and it's taking way way much longer to download from the net.

To add to this, when attempting to copy a folder from a dvd to my hard drive I now get input/output error .....this disc and others worked perfectly before the erase and re-installation of the OS....

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