@Nitin Kumar No Nitin,I had to increase the RAM size upto 12 GB.but instead of vmware try with virtualbox.
Because for me with 12GB also I was not able to install sandbox in vmware.but in virtualbox i did it.
Some laptops/desktop you might need to enable virtualization Please go through theses steps
Power on the machine and open the BIOS (as per Step 1). Open the Processor submenu The processor settings menu may be hidden in the Chipset, Advanced CPU Configuration or Northbridge. Enable Intel Virtualization Technology (also known as Intel VT) or AMD-V depending on the brand of the processor.