not detecting crizer blade

i have 4 gb sandisk cruzer blade pendrive. when i connected to any p c shows an error usb hasbeen multifunctioned plz solve my problem. and suggest me. i have most imp data in that…i m waiting for correct suggestion

Hi. Have you already all these steps?

If yes, try disable the U3 functionality. 

Try other USB ports if the light on the Cruzer flash drive does NOT illuminate when plugged in.