In your situation, If your VMWARE edition is higher than 6.0 the snap-in tool could help you increase the VMD, however, after you increase it, the unallocated space may be at the end of the VMD, you need to use other third-party software to add it into your partition which you want to icrease, here is an article about this operation hope it could help you.
http://extend-partition.com/resource/vmware-resize-virtual-disk.html
