I agree, the formatting is likely the issue.
Here's a TEXT summary:
1. Go to "Computer Management"-> "Disk Management"
2. right-click the Hard Drive-> "Add Volume"
3. Then *FORMAT it.
4. Should appear in Windows Explorer now.
There is a Quick and Full format. I strongly recommend you do a FULL format before using it. This Reads and Writes each location to build a Bad Sector Table. If you only do a quick format you may have bad sectors and get corrupted data.
A full format takes HOURS (roughly 10 hours on a 2TB drive). You can still use your computer but don't shut it OFF until formatting finishes or you'll need to restart.