Hello
When the install did not work properly  ( I've never had that problem ) you can start the elog service with the SC.EXE command like this :

sc.exe create Elog binpath= "\"c:\program files\elog\elogd.exe\" -D -c \"c:\program files\elog\elogd.cfg\"" displayname= "Elogbook services" start= auto type= own

Please notice the spaces after the =  ( they are required )

You can now use :
net start elog
and
net stop elog

to start the service without a reboot.

Maybe this helps.