Pues por que tu CPU Microprocesador no solo soporta y no lo podras hacer funcionar.
(O puedes verificar si el soporte VT-x está habilitado en la BIOS, lo mismo esta deshabilitado)
Debes de mirar si tu Microprocesador soporta 32 y 64 bits hay CPUs que no y CPUs que si y en algunos casos si los soportan de 64 bits pero vienen de la tienda con las caracteristicas deshabilitadas en la BIOS.
Es lo mismo que los Sistemas operativos de 64 Bits, hay CPUs microprocesadores que no lo soportan.
El VMware 9 puede ser instalado en SO de 32 pero con CPUs que soporten funciones de 64 bits pues el VMware 9 utiliza tambien funciones de 64 bits.
Requisitos Minimos:
Processor Requirements for Host Systems
You must install Workstation on a host system that meets certain processor requirements.
Supported Processors
The host system must have a 64-bit x86 CPU that meets the following requirements.
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LAHF/SAHF support in long mode
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1.3GHz or faster core speed
Multiprocessor systems are supported.
When you install Workstation, the installer performs checks to make sure the host system has a supported processor. You cannot install Workstation if the host system does not meet the processor requirements.
Processor Requirements for 64-Bit Guest Operating Systems
The operating system that runs inside a virtual machine is called the guest operating system. To run 64-bit guest operating systems, the host system must have one of the following processors.
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An AMD CPU that has segment-limit support in long mode
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An Intel CPU that has VT-x support
If you have an Intel CPU that has VT-x support, you must verify that VT-x support is enabled in the host system BIOS. The BIOS settings that must be enabled for VT-x support vary depending on the system vendor. See the VMware knowledge base article at
http://kb.vmware.com/kb/1003944 for information about how to determine if VT-x support is enabled.
When you install a 64-bit operating system, Workstation performs checks to make sure the host system has a supported processor. You cannot install a 64-bit operating system if the host system does not meet the processor requirements.
Processor Requirements for Windows 7 Aero Graphics
To support Windows 7 Aero graphics, the host system should have either an Intel Dual Core 2.2GHz or later CPU or an AMD Athlon 4200+ or later CPU.