My son put my 4G aircard from my Apple into the USB port in his Acer. It wouldn't work, so he just pulled it out without going through the eject function. Now when his Acer is turned on it won't sign on at all. It goes to a black and white screed for Windows Boot Manager and says it is an error cause by unplugging the USB drive while the device was in use. If you push enter, it goes to the Windows Error Recovery black & white screen. No matter what you do, it just goes back & forth between those two screens. I can't even get to a Windows screen to to any recovery program. Help!