As long as Windows is configured correctly, it should automatically handle daylight savings changes for you.If Windows isn't handling it correctly, it most likely needs to be updated.
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If you uninstall the old version first, you will need to restart your computer before starting the new installer.
Net Time is failing to sync - it reports that all servers failed: The most common cause of this error is that a firewall is blocking the Network Time Protocol (UDP Port 123) between your system and the servers that Net Time is attempting to use.
You can quickly install the client by running the above installer with either the /silent or /verysilent command line switches.
If you want to preconfigure settings that are different to the defaults, they are stored in the registry under: HKLM\Software\Subjective Software\Net Time On 64 bit systems, the above location is remapped to: HKLM\Software\Wow6432Node\Subjective Software\Net Time Version 3.20 Alpha 3: Despite the amount of work that has gone into this updated version, most of the credit for it still lies with Graham Mainwaring.
If you can run a UDP traceroute to port 123 on one of the time servers that you're using, that should give you an indication of where the firewall is located.