Hauwei E220 Modem not recognized by windows

Hi there,
I am using windows 8 on Dell Latitude E6400, I have been using this Hauwei E220 Modem with GSM simcard for browsing over a week now, this evening, windows could not recognize the modem but shows it as flash drive, the connection software will indicate the modem is unrecognized or not connected to the computer, Modem drivers are okay. What could be the problem? how do I fix this since fresh install of windows is not working? (the Modem works fine with my friend's computer)
