In order to run 64-bit guests in a Hypervisor, you need a processor which supports VT-x (Virtualization Technology), and this feature has to be enabled in the host's BIOS. Note that you may need to power cycle the host after changing this setting. A simply reboot might not be sufficient.
If this doesn't solve the issue, then please attach the virtual machine's vmware.log file to a reply post.
André