Difference Between 64 and 32 bit processors:
Both 32-bit and 64-bit architecture setups have been around for decades, but were mostly used in complicated enterprise computers like the IBM 7030 Stretch, built in 1961. 32-bit architecture was available to consumers in the 1980s, and the Intel 386 was one example.
In order to create a platform that is capable of running in 32 bit processors, 32 bit based operating systems and softwares were developed and similarly for 64-bit processors, 64-bit based operating systems were developed.
However, Windows did not become a 32-bit operating system until Windows 95. Windows XP was the first consumer version of Windows to receive a 32-bit edition and now in 64-bit edition.
A 32-bit version of windows can access upto 4GB of RAM when paired with a 32-bit or 64-bit processor.
A 64-bit version of windows can access larger than 128GB of RAM when paired with a 64-bit processor.