I have just got the same error when trying time.windows.com so I suspect there is some sort of problem with the time servers. But I usually use time-a.nist.gov anyway and that has just worked ok.
If none work for you turn it off by de-selecting the "Automatically synchronize with an internet time server" and try again later.
I also use Atomic Clock sync from Download.com ( http://www.download.com/Atomic-Clock-Sync/3000-2350_4-10316305.html ) but I only use it rarely now as it isn't necessary with the internet time capabilities of the Windows clock.
on internet time page..."An error occurred while windows was synchronizing with time.windows .com." Get same error message with other listed time server too."An error occurred while windows was synchronizing with 'time server whatever'.
Did a google search and the only thing of value i found was to switch servers which is not working. Does anyone have a fix for this? Is there a 3rd party program which will work. ?
Thaknks for any help i can get,