My Laptop is ThinkPad T410 with Intel Core i5 M520 @ 2.4GHz and Windows 7 Enterprise 64-bit. I want to install a CentOS 5.6 64bit as a guest OS using VirtualBox.
But had the error "Your CPU does not suupoort long mode. Use a 32bit distribution."
It turns out that I have to turn off a BIOS setting for VT-d which is enabled by default. After that, when you create a new machine, enable Settings->System->Acceleration->Enable VT-x/AMD-v. Then everything works smoothly.
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