Unable to install CentOS in VirtualBox

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http://unix.stackexchange.com – I am trying to install CentOS 5.6 in My VirtualBox but i got this error on boot screen. Your CPU Does not support long mode : use a 32 bit Distribution My CPU is 64 bit i checked that using uname -a command and the output is Linux localhost.localdomain #1 SMP Mon Jun 4 20:33:44 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux As per my knowledge i need to enable 32 bit support to my VirtualBox but i don't from where i can enable that. If you have any idea regarding this then please suggest me. Thanks & Regards (HowTos)