Answer:
For security reasons, many games have a code or a serial number to protect their products. But every copy of the software have a special code, that don't match or is very unlikely to match with other copies of the software.
We could give you a serial number but it's almost sure it won't work.
Some companies allow clients to retrieve their codes if they registered, so you could try this way.
Bottom line: if you lost your serial number, you could retrieve it if you registered your product and if the software company allows you. Otherwise, it's very unlikely to get a serial number that will match your copy of the software.
If this doesn't answer your question, please give us more info about your problem.