i think i have made it too where she's at.
i'm downstairs and it's telling me to hack the computer and when i do so nothing. my guy just stands there and if i go upstairs the game ends saying my mission fails. do to irena got a way.
how do you kill her.
at first i sent my guy to hack the computer and it shows him doing something then it just ends saying the same thing.

i went backwards thinking i missed something and now i think there's some kind of glitch.

can anyone help me out..

If you are on ps3 I could help you out.Its been so long since I have played through the campaign but I do remember what you are describing a little.I would probably have to play it to remember.

not sure what happened there but... get your two guys over by the computer under the platform and equip smoke (it will be easier this way). You should be able to point at the computer and tell your guys to hack it (not you). Then guys will repel down and you should drop some smoke and turn on your thermals. The enemy can't see you so take advantage while you can.

Once the enemy is cleared your two guys will start to talk.. proceed upstairs.