Macbook air either not working or working very very slowly on wireless

At home I have 2 laptops: a macbook air and a compaq presario v6000. The macbook air is either working very slowly with the eircom broadband, or else not working at all. The presario works at a good speed and  is consistent. The air is fine on all other networks. Strangely, download speeds are normal nbut nothin else is normal.
I'm running OS X if that matters

Power off the router. Wait awhile. Power it back on. Wait until all the lights are lit up properly.
It will take a while.
Restart the computer.
Start up in Safe Mode
http://support.apple.com/kb/PH11212

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