OK well my current setup is like this:

Modem
|
v
Router
|
v
My Computer (wired) - Computer 1 & Computer 2 (wireless)

Now my computer never disconnects, however it seems that computer 1 and computer 2 are constantly doing.

They seem to start working again a few minutes after disconnecting, now personally I would say its the signal that is causing this, the signal is usually on around 40 - 50 percent.

But my father who owns the other two computers which are disconnecting seems to believe it is my Xbox 360 that is interfering with it, is this at all possible?

I have the following ports forwarded to my xbox 360:

192.168.2.112 UDP 88 Xbox Live
192.168.2.112 UDP 3074 Xbox Live
192.168.2.112 TCP 3074 Xbox Live

If anyone could shed some light on this situation it would be a great help

Thanks, Rob