Windows C Drive --(transfer to)--> Mac OS Extended (Case-Sensitive, Journaled, Encrypted) : Within Windows

Windows C Drive --(transfer to)--> Mac OS Extended (Case-Sensitive,
Journaled, Encrypted) : Within Windows

I have an external hard drive whose format is Mac OS Extended
(Case-Sensitive, Journaled, Encrypted), and I would like to copy my
friend's entire computer--it's running Windows 7 Home Premium--to the free
space on this external drive. How can I do this, and once I have a method
of transferring Windows files to a drive with Mac OS Extended format can I
just drag and drop the C drive of the Windows machine into the external
drive?