I can't access the hard drive

You will need to initialize it from the Disk Management. To do this, right click your My Computer and choose Manage. At the left panel click on the Disk Management. The list of available drives will show on the right.

Right click on the drive and a window will popup. Select create partition (primary partition). After you've selected your partition , now you need to format the hard drive. Choose quick format. Right click again on the partition you've just created, now select "Format" and select NTFS. Click ok and it will guide you until it is finished.

If you need further assistance, just let me know.