Problems with Battlefield2 1.03

[gorro]

Hello, I've the ISO of this game and the patch. I've installed the game via winiso, used an original cd-key bought on ebay, applied the patch 1.03, and used gamejack 5.0.4.2 to make the game run without any dvd.
This thing does work for 1-2 days only, because after some time that I play (and online, and offline) the game doesn't start anymore. After the screen becoming black, it returns back to the desktop like nothing has happened. I have everytime to reinstall the game, but it works only for 1-2 days.
What's going on? Before the patch and/or legitimate cd-key it worked fine.
Heeeelp plz!