I am glad to HELP YOU!
If you don't have the key you cannot install the operating system [which I assume it's about a Windows XP].
This case you have to options:
1. ask from the manufacturer [Microsoft] a REPLACEMENT CD because you have lost the initial one [assuming you've BOUGHT the previous one...!];
2. buy another installation CD.
There are some FREE software that help you to get your product key but for each one apart you have to have THE OPERATING SYSTEM INSTALLED already on your computer.
A list is
HERE.
GOOD LUCK!
... and don't forget to RATE, please...
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