VMware Tools

You can shrink a disk from inside a virtual machine running Windows with a command line utility named VMwareToolboxCmd.exe. The disk must not be a pre-allocated disk but should grow dynamically. 

Shrinking a disk can also be done from the Control Panel VMware tools entry, but when that is not available you can also do this from the command line. The utility is located in the folder C:\Program Files\VMware\VMware Tools.