I didn't download Kies...did this on my work computer which definitely has never had any Samsung phone software on it.
It's running Windows 7 64-bit Professional if that helps.
my home desktop (Windows 7 64-bit Ultimate) didn't need it either - just tested now. All I installed on both machines were the normal USB drivers.
LG G2x - Eaglesblood AOSP - sold
Samsung Galaxy S3 - CM10 - sold
Samsung Galaxy Note 3 - rooted, removed bloat, Knox, CIQ - current