i remember making a slip stream install of windows 2000 x64 edition. it was a bit unicorn finding drivers/hardware but that is still the fastest desktop experience ive ever seen in 30 years
No x64 (AMD64) version of Windows 2000 ever existed. AMD64 CPU's didn't debut until 2003 and XP x64 was based off the work done on 64-bit Server 2003 for Intel's 64-bit Itanium chips
There was a brief period of Alpha machines that ran 64-bit CPU's that had early "Whistler" builds but nothing ever released to the public