Yes. Unfortunately, no version of Windows provides any way of changing the
existing partition structure of the drive nondestructively. The only way to
do what you want is with third-party software. Partition Magic is the
best-known such program, but there are freeware/shareware alternatives. One
such program is BootIt Next Generation. It's shareware, but comes with a
free 30-day trial, so you should be able to do what you want within that 30
days. I haven't used it myself (because I've never needed to use *any* such
program), but it comes highly recommended by several other MVPs here.
Whatever software you use, make sure you have a good backup before
beginning. Although there's no reason to expect a problem, things *can* go
wrong.