The remaining of your purchased hard drive space is assigned to an unallocated partition.
To extend your C Drive to the full size follow the steps below.
- Click Start
- Right Click Computer
- Select Manager
- Expand Storage and Select Disk Management in Left Column
- On the Unallocated partition right click and select Delete Volume
- On the C: Drive partition right click and select Extend Volume
- Click Next through all of the prompts