Vista was heavy. The "Vista Capable" marketing lawsuit highlighted that many PCs sold as "Vista ready" could barely run the OS. The x64 version added overhead that strained the CPUs and HDDs of the time.
Here’s a comprehensive guide you can use or adapt. vista x64 iso
Installing Vista x64 today is surprisingly difficult compared to XP or Windows 7. Vista was heavy
A is a disk image file containing the 64-bit version of the Windows Vista operating system. While Microsoft officially ended extended support for Vista on April 11, 2017, these ISO files remain popular for enthusiasts, retro-computing hobbyists, and users needing to maintain legacy hardware or software. Why Use the 64-bit (x64) Version? vista x64 iso