i think you r suppose to click ok when u see the hackshiels pro thing in the bottom right corner when u start the game. also, u should also do what skool said to do but change # 3 to what i just said to do. it worked for me! Thank me if i helped.
1: Go to hack and double click on the large 'M' icon. Should be an .exe file.
2: A box will appear, click okay and than exit out of the MPGH.net window that appears.
3: Double click on Combat Arms, get it started.
4: Look for words in bottom left corner. If they're not there, than re-do steps 1-3.
5: Press the 'delete' key to open the menu.