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In my system BIOS virtualization option is missing. After research found that my system doesn't support virtualization.

Laptop model : HP DV6-1152TX Processor : Processor type - Intel Core 2 Duo Processor T6400 * 2.0 GHz, 2 MB L2 Cache, 800 MHz FSB BIOS version : F.25 Operating System : Windows 8.1 pro 64 bit

Please let me know best way to resolve this issue? If I have to change the CPU what are the specifications I need to consider? Does virtualization is essential for Cloudera Quickstart VM. Is there some way one can use Cloudera Quickstart VM without using virtualization or upgrading BIOS and CPU.

Thanks,

Your CPU doesn't support VT-x, so you would need to swap it.
But it probably won't help because the BIOS is missing a setting to activate it anyway.

It looks like you would need a newer system.

All of the QuickStart VMs are 64bit. Cloudera (CDH5) itself is apparantly 64bit only, so I'm afraid the answer is no: there is no way to run this in a VirtualBox VM on a host which doesn't support hardware virtualization.

Cloudera Quickstart is a large powerful program. I doubt that it would even run directly on your machine, let alone as a vm on it.