Hi Vicious.
Man for me, you have 2, possibly 3 problems, Macafee, routing & possibly your ISP shaping your connection.
First Check Your ISP, ring them & ask direct are you shaping P2P traffic, ASK
for that in writing,they wont fob you off then,If there not,Great!! we can continue, If they are shaping, theres not much point in doing the rest of this.
2...Other users have said disabling Macafee dose not Work, you need to uninstall it, Here is a link to a removal tool at Macafee web site.
http://ts.mcafeehelp.com/
If you must, you can try installing it after you are sure you have your routing
configured correctly.
3..I would make a new thread (How do I portfaward 2 computers on 1 con.) cos i'm lost with this subject.
It may go unseen here
Help Here Anybody
If I can help with anything els just shout.
Peace.