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Well I have heard of two other people that had the same thing, It apeared to be a virus on the system, or had a virus cleaned from the system that deleted system files.

You could try and copy the whole CD to the HD and install from there as a test.
 
Have to pin down which one it is first, so we know what to look for.
 
When you say copied to the hard drive, do you mean you tried to install them or your tried to manually copy them over to the HD so you could try installing from there?
 
Have you tried cleaning the disk with windex or an eyeglass cleaner?