Which release - current stable 4.2.6p5 - or previous?
Did you check to see if the process was already running under TaskManager all users processes?
Does the ntp userid have access rights to the config, log, and stats directories?
Are you running on W7 32 or 64 bit?
What is the output from the command:
reg query HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\NTP /s
It should look something like below but perhaps with more quotes and backslashes, different paths, and shorter ImagePath (service start command line):
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\NTP
Type REG_DWORD 0x10
Start REG_DWORD 0x3
ErrorControl REG_DWORD 0x1
ImagePath REG_SZ "C:\Program Files (x86)\NTP\bin\ntpd.exe" -g -M -s C:/ProgramData/NTP/etc/ -p C:/ProgramData/NTP/etc/ntp.pid -l C:/ProgramData/NTP/etc/ntp.log -f C:/ProgramData/NTP/etc/ntp.drift -c "C:/ProgramData/NTP/etc/ntp.conf"
DisplayName REG_SZ Network Time Protocol Daemon
DependOnService REG_MULTI_SZ Tcpip
WOW64 REG_DWORD 0x1
ObjectName REG_SZ .\ntp
Description REG_SZ Synchronizes the local system clock to a reference time source and (eventually) provide this time to NTP and/or SNTP clients
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\NTP\Parameters
ConfigurationFile REG_SZ C:/ProgramData/NTP/etc/ntp.conf
If all else fails, try a restart, then an uninstall, then another restart, then another install, then maybe another restart.
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Take care. Thanks, Brian Inglis