Question : Windows Messenger service needs restarted everyday

I am using windows 2003 server with 10 clients running xp sp2
the server is runing dhcp
i use a third party app that sends internal messages to all users using the messenger service.
The problem is that everyday messages stop working and the only way i can get them going again is stop and start the messenger service on each individual pc, that then solves the problem for the rest of the day.
I am running wins and all seems to be ok, on the computers that are not working when i check in wins all computers have 03h entries some are active some are released.
I have tried enabling netbios over tcp on every network card, set the messenger service to restart on failures , long dhcp leases etc etc etc.
Does anyone know how i can fix this as it is a pain having to dial in every day do a net send /users test to see which computers are not working and having to restart service.

Answer : Windows Messenger service needs restarted everyday

use SC.EXE supplied with the Support Tools

sc \\computername stop messenger
sc \\computername start messenger

or from within sysinternal tools http://technet.microsoft.com/en-us/sysinternals/bb896649.aspx

psservice \\computername restart service