dann klick doch auf den link wo chilla hier gegeben hat! als herumzuheulen

bei mir hilfte z.b. das:
5. Re-Enter the CD-Key
  1. First of all please go to "..\My Documents\My Games\" and delete the whole "Crysis" folder.
  2. On the Crysis DVD please open the folder "Tools" and double click on "Crysis_code.exe".
  3. If you have the download version you can find the .exe file here: C:\ProgramData\Electronic Arts\EADM\cache\{number}\crysis_seX\tools
  4. In the case you do not find the file use the windows search tool. Make sure you search in hidden folders as well and search for "Crysis_code.exe".
  5. Re-Enter your CD-Key in capital letters and click "OK" afterwards.
  6. If you launch the game now everything should work as intended.