Using the Ps3 Controller On PC Help

Hi,
I set up my PS3 controller to work on my PC, had it working fine. I then wanted to use a different USB port but for some reason the controller would come up in teh control panel as ps3 controller but no inputs would work unless it was plugged into the usb poirt when i first set it up. I tried to uninstall and reinstall the drivers to see if that would fix it but now I am left with the controller now registering any inputs even in the origional USB port. Does anyone know how I can fix this? Ive tried manually removing the ps3 controller from device manager, pressing the home button on the ps3 pad, manually deleting the driver filese from windows folders but for some reason when i plug in the ps3 controller it doesnt sasy new hardware found, it pops up as ps3 controller but wont register any buttons =( its driving me mad
Thanks

It may be useful for some if you post which OS you're running.

also what driver your using, heres one for windows called Libusb

windows XP and I am using the drivers you metioned above