for the uninformed
http://www.novalogic.com/supportarticle.asp?ID=79
PROBLEM:
My CD-KEY is not recognized when I install the game!
RESOLUTION:
If the CD-KEY is not accepted when installing Delta Force 2 from the DF- Trilogy product, use the following installation codes:
Delta Force 2: J5V3-R9P8-ZHR9-WE53-XSDH
Please keep this keycodes with your product in case you re-install the game in the future.
IMPORTANT: WHEN PROMPTED FOR A CD-KEY WHEN REGISTERING ON NOVAWORLD, USE THE ORIGINAL CD-KEY THAT CAME WITH THE PRODUCT.