PSP - USB Device Not Recognized

PSP - USB Device Not Recognized
I tried to connect my PSP to my computer, but when I connected the USB to PSP error message appears on the taskbar stating: ". One of the devices attached to this computer has malfunctioned, and Windows does not recognize "And when I clicked on the message as specified window appears titled USB device not recognized and the location of the" unknown device "was listed, but not using the unused USB port. This puzzles me. How come my computer does not recognize the unit PSP? I tried plugging in my USB flash drive and was running well.
Her birthday is my little brother that I bought one month in advance to try it myself because I want to work correctly before you give it. I need a fix faster than his bday is fast approaching, I feel cheated. I tried Googling, dived into some forums and saw many similar problems but no real solution.
Some said to reformat the Memory Stick, some suggest to plug in different USB port or try it on another computer, some told me to uninstall the USB drivers Device Manager and reboot to install Windows ... But none of those things for me, then come to a conclusion that may be defective USB cable so I bought a new cable and Voila! I got the job .. I never thought that the problem is the USB cable because it was day before.