Pentium D E5200 a 64bit CPU?

So when I purchased a Pentium D E5200, I was under the understanding that this was a 64bit CPU. I put everything together and I want to install 64bit Vista and I keep getting BSOD (Blue Screen of Death) pointing at some ACPI.SYS issue.

So I stick in my 32bit Vista and that installs just fine.

So my question should be obvious now, is a Pentium D E5200 not a 64bit CPU? What is this "Intel® 64" technology that this CPU is sporting then?
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  1. There's no such thing as a "Pentium D E5200", but the E5200 is a 64-bit CPU.

    I'm guessing you're probably having some trouble with your RAM. What are your complete system specs? Have you manually set the RAM speed/timings/voltage to the manufacturer's specs in the BIOS? Have you run Memtest86+ overnight to test for RAM errors?
  2. yes it is a 64bit CPU, maybe your vista64 disc is corrupt.
  3. I'm having the same problem. When I purchased the computer it came with Vista x64, but the other day it froze in middle of installing Windows 7 x64. Now the only thing that will work on it is 32-bit XP. I've tried two different 64-bit Windows 7 discs and a 64-bit Ubuntu disk, but I just keep getting an "Unbootable Disk" error.
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