"01:09.0 Network controller: RaLink RT2500 802.11g Cardbus/mini-PCI (rev 01)"
Next, Check you speed (right click on the connection and choose Connection information). If it says anything less than 54Mb/s, open up /etc/rc.local (as root) and add the following lines:
Replace wlan0 with you interface name. Worked for me.
ifconfig wlan0 up
iwconfig wlan0 rate 54M
To put in to effect immeadiately, open up a terminl and run:
sudo /etc/init.d/networking restart