Ok, so I was playing around with settings, and I found a way to make it so Hamachi will work with System Shock 2 multiplayer. (This is in Windows 7, not sure if works in 8, Vista, or XP) BOTH PEOPLE HAVE TO TAKE THESE STEPS UP TO 11.

1. Turn on Hamachi.
2. Make sure your friends are in the same network as you.
3. Open Control Panel.
4. Go to Network and Internet.
5. Go to Network and Sharing Center.
6. Go to the left and click on Change Adapter Settings.
7. Press Alt to open the toolbar, between your networks and folder trail at the top.
8. Click on Advanced, then Advanced Settings.
9. Look in the first list labelled "Connections:".
10. Find Hamachi in that list and move it to the top via the green arrow on the right.
11. Click OK, exit out of Control Panel, and open System Shock 2.
12. When at the System Shock 2 main menu, click on Multiplayer, and click on Host a Game, or Join a Game, depending and what you are doing.
13a. Hosts, put in your name, name of the save, continue, and tell your friend the IP Address beside your name in the game room (or your Hamachi IP)
13b, Joiners, put in your name, and put in the IP Address the host tells you.
14. Host, press ok, then everyone, HAVE FUN!

(Please comment if you know how to do this on different operating systems.)

and

SAVE

OFTEN

Yes, that really helps.