Increase data transfer speed in WD MY PASSPORT USB 3.0 EXTERNAL HDD

i am using my passport usb 3.0 external hard drive but i do not get speed not more than 23 MBPS.
i am using window xp sp3, usb 2.0, pentium 2.93 GHz processor with 1 GB ram,
how can i increase data transfer speed
is there any problem with my drive or interface? ?
please suggest also any software to be installed if needed
waiting for u r reply
thank u

Check the driver on your USB 3.0 card for an update from the manufacturer. It sounds like you are getting USB 2.0 speed now.