Your processor is 64-bit.
According to Wikipedia (
http://en.wikipedia.org/wiki/64-bit
), the following processors are all 64-bit:
# AMD's AMD64 extensions (used in Athlon 64, Opteron, Sempron, Turion 64 and Phenom processors)
# Intel's Intel 64 extensions (used in newer Celeron, Pentium 4, Pentium D, Xeon, and Core 2 processors
If you are also using 64-bit Vista then that should be fine.
I am currently using Vista 32-bit and the system sees only 3.2 GB of RAM.
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AMD Ryzen9 5900X CPU, 64 GB RAM 3600 MHz, Nvidia GTX 1060 6GB, 500 GB NVMe SSD
2x28" (2560x1440), Windows 10 PRO ENG, Ac20-Ac28