E5700 not running 64-bit OS

[Bermudex]

I have a Pentium E5700 CPU mounted on an ASUS P5G41T-M LX3 motherboard with 2 GB of RAM.  CPU is genuine Intel as reported by the Intel Processor Diagnostic Tool.  BIOS is American Megatrends v 0402.

Even though the specs for this CPU specify that it supports 64-bit versions of an OS, this machine stubbornly insists that it will only accept 32-bit versions.  I tried to dual-boot with Win10 (the other OS is Win7 32-bit) and a trial version of Linux; both run fine at 32 bits, but refuse 64-bit instruction sets.

Any ideas?

[AlHill]

Your 2010 processor is discontinued and not supported.

Yes, it supports and runs 64-bit OS:

https://ark.intel.com/content/www/us/en/ark/products/42801/intel-pentium-processor-e5700-2m-cache-3-00-ghz-800-mhz-fsb.html

You can run IPDT to test your processor:

https://www.intel.com/content/www/us/en/support/articles/000005567/processors.html

Rather than dual boot, I suggest just a clean install with W7.  As far as W10, your processor is not supported.

https://docs.microsoft.com/en-us/windows-hardware/design/minimum/supported/windows-10-21h1-supported-intel-processors

Doc (not an Intel employee or contractor)
[Windows 11 is the new Vista]