Support windows 8 won't recognize Razr

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http://androidforums.com – I downloaded driver from Motorola. I also installed MotoCast. This is a brand new HP windows 8 machine & Razr still doesn't show up in device manager. I am using the proper USB cable. USB debugging is checked & Unknown Sources is checked. Is anything else required? What do I need to do to be able to transfer from computer to phone? Thank you. (General)