Need Help

[Stamatis]

Hi.
I am a newbie in copying programs and please help my ignorance.

I have the original CD of a program and the serial number. The original CD contains the installment files.

When I copy the contents of the CD on my HDD the serial won't work.It gives this message:"This serial number has expired..."

Note:The serial gets asked when you run the installment.

What could be the problem and how could I get it fix?How could I install the programm from my HDD(with the files being on my HDD?).
Please could you post some ideas?
Thanks