Wireless advice please!!

Advice please

I have the new aluminium macbook and had issues with it connecting to my existing wireless network so I got BT to send out a replacement. I now have the new BT Home Hub.

I set up the hub on Saturday and manually connected my mac and another new laptop (running windows) to the network, I did this by entering the WPA key.

All was going well until Monday night when I tried to download the game Second Life onto my mac. The download took over an hour and when it finally completed it said it "mounting failed".

The next day I connected my mac via the ethernet cable, downloaded it again and it took about two minutes and mounted fine, I then installed it with no problems.

However, before and after this my connection on my mac became really slow. Later on last night I noticed the broadband and phone lights on my hub had gone from blue to orange (they should be blue) BT said to just unplug the power and then plug bk in. This worked.

However, my mac still remained really slow, lost the connection, got the connection bk and was all over the place. It said connected, showed strong signal but wouldnt even open google. Earlier on that day I got a message asking if i would allow deny or always allow MAC OS to remember my confiedntial information about my network, so i clicked always allow.

I think this saved it so I don't have to enter it when there is a problem because last night i didn't have to enter it as it was already there. But when I ran network diagnostics (when the connection for the second, third time etc) I entered the WPA key and although I know the key was correct the connection failed.

ANY SUGGESTIONS?

The windows laptop internet connection was also playing up but was connecting when I prompted it to.

The only thing I did yesterday was two things.

Connect my mac to the hub via ethernet cable and download second life.

With my other router after I connected the thernet cable to the mac a network appeared called apple network bf123 (similar to that)
and then yesterday it also appeared after I connected the ethernet cable.

I thought it must be a neighbour with a apple extreme base station but now it seems this network only appears AFTER I connect the ethernet cable.

ANY IDEAS?!

And do you think Second Life is to blame for this? should I delete it?

I was also thinking of changing the wireless channel, it is currently on channel six, what do you think?

Thankyou for your time,

Vicki