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On your vmware host run the following command from your windows host command prompt:

C:\path to vmware\vmware-vdiskmanager –x 50Gb windows.vmdk  (where windows.vmdk is the vmdk to expand)

Now boot your VM, login and run the following commands from within the vm to expand your new vmdk

1)diskpart.exe
2)list disk
3)list volume
4)select volume=#   (where # = the volume you need to expand)
5)extend