[3tb Seagate drive only showing up as 746gb w BLACX]

Having a problem with my new Seagate 3tb hd only showing 746gb of drive space. Its formatted w GPT so their shouldn't be an issue.  I contacted Seagate and they said I need to use their discwizard. However, it won't install on my computer because the computer doesn't show the drive as a Seagate . Anyway I'm stuck and hoping there might be a work around from someone in the forum. Any help is greatly appreciated!!!

 

Windows 7 64bit