If you recently upgraded to VMware 5.5 you will notice this warning if you try to edit your virtual machines.
“You cannot use the vSphere Client to edit the settings of virtual machines of version 10 or higher. Use the vSphere Web Client to edit the settings of this virtual machine.”
Unfortunately the vSphere Web Client is not free. So while you could download this you would be running in trial mode. The simplest fix for this issues is to follow the following steps.