Microsoft has released two major Windows versions for the x64 architecture (also known as AMD64) Microsoft has opened the door to inexpensive 64-bit computing for just about everybody. The significance of this, of course, is that there is a great plethora of spyware and adware which installs from the Internet via IE vulnerabilities, through the use of ActiveX technology or Java applications. A 32-bit version of IE is also available from the Start menu of Windows XP x64.”]
Source: https://securelist.com/exploring-the-x64-treme-heights-of-the-internet/36088/