1. Tried running as Administrator or Windows xp Server Pack 3?
2. Tried using a different Injector?
3. Are you using the stand alone version (not steam)?
4. Removed/fixed all viruses and errors on your system?
5. Check your anti-virus' chest/lock/quarantine to check if it's removing the .dll and reporting it as a Trojan.dropper? (Or others)
All I do is- Run Blackdragon Injector, select Crysis2Demo, choose the .dll, tick auto inject+close and run the game
Good Luck.
Finally got it working just had to use that dragon Injector none of the other ones seem to work
Hmm, Crysis 2 MP Demo updated to day (Steam) does it still work?
Not working for me :/ it says the hack was injected but i press f1 or insert ingame and nothing happens
on my computer hack crashes after the loading screen, you hear the kick and then lags a bit then crashes, then error message pops up saying "Crysis 2 (TM) Demo has stopped working"