URGENT! My Passport USB 3.0 Not Working

A couple of hours ago, i got a My Passport 1TB External Hard Drive. I immediately installed it (not the smartware though) and started copying all my steam files onto it. After about an hour of waiting, i realized that the hard drive had been put in the USB 2.0 port instead of the 3.0 one. I cancelled the copying process, and without thinking, unplugged the device without ejecting it. I then inserted it into the 3.0 slot and nothing happened. I checked the device manager (windows 7) and “WDC WD5000AAKX-00 1CA0 ATA Device” (the hard drive) will not eject, and says that a program is using it right now. But the hard drive is unplugged. Why won’t My Passport connect to USB 3.0 and do i have to return the product to the store?

System Specs: Windows 7 Home Premium 64-bit, Intel Core i3-2120@3.30GHz, 8GB RAM, AMD Radeon HD 6700

Try restarting the computers and updating the drivers for 3.0