Let's address SCDA (Xbox) first, then after that post here again with the specifics of your SC1 mission 2 (defense ministry) problem.
If you're going for all the objectives, including killing Syke's and Moss' men, the following will get you through it (you'll have 32 kills/ko's in your final stats). There is a way to stealth your way through this, but you fail the elimination of their men (you can also use the 'stealth KO' which won't count in your stats - but is VERY difficult to do in this mission).
**** SPOILER ****After you ZIP to the next building, turn right and go all the way up. Climb the ladder and turn right. You'll be standing on top of an elevator with a locked TRAPDOOR. Pick it open and jump down to meet with Enrica.
Exit the elevator, turn right and open the only door on this floor. Slowly enter the room to see 2 guards with Night Vision. After you open the door, put your back against the wall next to the door from outside and turn the camera to see one of the guards walking nearby. When he turns his back quickly but quietly GRAB him and drag him outside to kill him.
For the second guard, enter the room and put your back against the wall. You should be able to change camera angles and see him walking around. When he turns around, go up to him and kill him. Hide the body outside.
For the last guard, he slowly patrols the hallway, so when he turns around, GRAB him and kill him. With this room cleared, enter the next area.
There are two guards in this office. One patrols near the doorway and the other patrols the opposite side. At the door, use the Optic Cable and watch the first patrolling left and right. When his back is away from you, quickly open the door, enter the room and GRAB him. Drag him outside and kill him.
For the second one, stay near the doorway and then rotate the view to see his movements. When he turns around, quickly and quietly approach him and kill him. Now exit this area to the next room.
As you enter this room, there will be a Wall Mine on the wall. Shoot or disable it and then head to the area behind the bar. Patiently wait there and a guard will emerge from the hallway. Your best bet to getting him is to use a Sticky Shocker on him. Now go up the stairs into the hall and OCP on the laser. Put your back against the wall on the right side and then look around the corner to see another guard.
When he turns around, use a Sticky Shocker on him. Now exit this area to a stairway leading upstairs. Slowly and quietly head up the stairs. Turn on Thermal Vision to see the movements of the guards inside the room (DO NOT OPEN THE DOOR!). When the guard patrolling nearby turns around, open the door and shoot a Sticky Shocker.
Enter the room, turn around 180 degrees and quickly shoot another Sticky Shocker on the second one at the other end. This will clear
this area. Now exit this room. Use the EEV on the computer in the glassed in room to get the Meeting Room's access code (4869).
The main office has four guards, a turret, and Moss himself. As you head down the hall towards the main office, you will encounter a hallway with an annoying turret. This turret can be hacked but it does NOT turn it off. If you use the OCP or an EMP bullet, it creates more
problems.
If you look above the turret, you'll notice that there is a glass walkway above. If you EMP the turret then run back and jump up onto the overhead glass, the lower floor guards will come under you. Turn on Thermal, and when
they pass you, quietly drop behind them. Grab the one in back and draw your pistol to shoot the other guard in the head, then kill the one you grabbed.
Go back to the entrance of the room to find the upper ledge of the ceiling. Jump on top and maneuver your way through the gaps (use the back-to-the-wall move) as you enter the main office area. From there, you can see two guards on the bottom floor, and two on the top office guarding Moss. To kill them all, you'll need to use some sniping skills.
Bust out the Sniper Rifle and start blasting them In The HEAD one by one. This will alert all of them, but if you stay in the shadow of the corner above, you can snipe all five men without problems. Once all five are dead, go to the bomb where Moss was and DEFUSE it to complete the objective.
im still stuck on the new york mission in sp:da but thats ok 
i'll get through it 
