Thanks Dave for the suggestion. I understand that the Sandbox would perform better against 64 Bit OS. In my case am holding and 64 Bit compatible Processor however the OS is 32 Bit.
The above issue was caused because I modified the OS selection in the Virtual box from RedHat Linux 64 Bit to Windows 7. Once I retained the original default option which virtualbox is placing on the Sandbox I was able to load and access Hortonworks Sandbox on by 32 Bit Windows 7 OS. However it seems that the underlying processor should be 64 Bit compatible for this to run.
Thanks again for the support