Wireless problems

[Northy]

We have a laptop and desktop at home and I'm having some wierd problems:

First the desktop. It is in the room right above the wireless router but keeps dropping connection. When it is connected it has 5 bars (as it is only about 10m away from the router in reality). This keeps happening in a constant cycle, connect for a few minutes, disconnect, connect etc. This happens when the desktop is on on its own.

When the laptop is switched on, the two seem to fight for connection. The laptop will drop offline also sometimes. This never happens when the laptop is on on its own.

Any ideas?

G