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?

http://kb.sandisk.com/app/answers/detail/a_id/10/kw/cruzer%20not%20detected

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.