Hello kdt,
The 64-bit version is for 64-bit OS versions. Is named Windows Defender64.msi
The 32-bit version is for the 99% of the users is named Windows Defender.msi
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The X64 is the 64bit installer - unless you have the 64bit XP Pro (which most
do not have) you will want "WindowsDefender.msi"
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I hope this post is helpful.
Let us know how it works ºut.
Еиçеl