[usb device not recognized]

 i just bought a freeduino (arduino clone)...i uploaded the blink sketch it worked fine...but after that my pc is not recognizing my board...
the moment  i plug in the usb, a message appears usb device not recognized each time this error appears
 avrdude:stk500_getsync(): not in sync:resp=0x00
specifications-
windows xp 32-bit sp2
freeduino (atmega8)

i guess theres some problem with the ftdi driver..
please i need help