Not sure why but since a few days ago my router hasn't been sending/receiving many packets via wifi. At the moment it's sending around 22 packets and receiving just 7. I've no firewall on my laptop (use the one on the router(white one)) I've reset the router (switched it off for 5 mins) but nothing. Is there any checks etc I can perform to see where the problem is? It's strange as it works perfectly fine with a ethernet cable but that means I'm stuck in one room.

running windows xp. the wifi card is a ralink (not sure which version)