No Com Port

I am hoping someone can help me. I just bought a 3D printer with a Sanguinolu board Rev 1.3a and sprinter firmware. I am using Windows 7 and its a 32 bit machine. The printer was connected and worked perfect for a day. The following day when I went to use it, the COM 3 port that showed under device manager disappeared. Now when I plug in the USB its says device malfunctioned and Windows error code 43. If I try to update the driver it says driver up to date, Ive tried using a different computer, deleting and reinstalling the driver, downloading new drivers, pressing the reset button on the board. I have no idea how to get this to show back under COM ports. Any information you can give me would be great and if you need any more info please let me know. Thanks so much.