I forgot to add that having partitions is a good thing. If he made the partition big enough you can save all your photo's, music, or any information you want to keep that could be potentially lost if you lose drive c from virus etc.

The reason is that the c drive is the only drive affected when windows crashes, or a virus, or corrupted file etc. The only thing that would cause you to lose the information on the other partitions is if the hard drive does go out. So even though you have these things saved there it is still a good idea to back up anything you want to save, but it will be safe there as long s the hard drive works.