Windows Jenkns Slave

[inforedaster .]

Hello,

Jenkins : 1.642.2

slave windows 2012 R2

In the Windows slave i check the service .msc but i don't find the jenkins slave service, when i open manage node in the Manage jenkins i click : Bring this node back online i have this log :

[windows-slaves] Connecting to WS8888
Checking if Java exists
java -version returned 1.7.0.
[2016-09-29 14:44:52] [windows-slaves] Installing the Jenkins slave service
[2016-09-29 14:44:52] [windows-slaves] Copying jenkins-slave.exe
[2016-09-29 14:44:52] [windows-slaves] Copying slave.jar
[2016-09-29 14:44:52] [windows-slaves] Copying jenkins-slave.xml
[2016-09-29 14:44:52] [windows-slaves] Registering the service
[2016-09-29 14:44:52] [windows-slaves] Starting the service
[2016-09-29 14:44:52] [windows-slaves] Waiting for the service to become ready
[2016-09-29 14:44:57] [windows-slaves] Connecting to port 56,783
<===[JENKINS REMOTING CAPACITY]===>Slave.jar version: 2.53.3
This is a Windows slave

i check the service.msc i find the service : "Jenkins Slave at F:\slave_jenkins"

but when i stop the slave from jenkins ths service disappears !!!!

i tried to delete the service and create a new service doesn't work and  if i restart the slave from ManageNodes the service si created but is note stable is disconnected every 10 hours

any help

thanks

Cordilally

Cordialement.