USB device not recognized windows 7 - keyboard

Friends,

I have windows 7 running on my laptop,it has 3 usb ports and I want to use external usb mouse and keyboard on it but suddenly today morning only 1 port is working properly , rest of the port are giving error :

USB Device not recognized.

But my keyboard if fine, i tested it on other computer.

How do I fix this problem ?

Are your other USB devices being detected by those 2 ports?

some of the laptop give extra port because if one port is damage u can use another one,in such stage u should only use one port at a time ,I am sure it will work properly