I've recently bought a gamepad that looks very similar to PS2 DualShock. It worked just fine except it didn't support force feedback (rumble, vibration) because it used the default Windows XP "Generic USB Joystick" driver. I had to spend several hours googling, reading forums, blogs, etc before I could find the right one
here. The driver can be downloaded directly using
this link.
Hope this will make searches for this driver simpler.