This was pulled directly from the HTC Sync 3.3.21 installer.
HTCDriver_4.0.1.001_20121107.exe.part1.rar and HTCDriver_4.0.1.001_20121107.exe.part2.rar are the executable driver installer. The other files are the drivers for the individual platforms.
Note: The last zip is labeled Win2k, but I suspect it is also intended for use with Windows XP.
Note 2: The Windows 7 drivers are reported to work with Windows 8.
NOTE: This is an older version of the driver, a newer version is available here.