Replace install Zabbix command to New-Service command...

zabbix_install.ps1

@@ -84,7 +84,8 @@ HostMetadataItem=system.uname
 Add-Content -Value "$confcont" -Path $ZabbixConf
 
 #Installing zabbix agent as a service    
-& "c:\Program Files\Zabbix\bin\win64\zabbix_agentd.exe" --config "c:\Program Files\Zabbix\conf\zabbix_agentd.conf" --install
+New-Service -Name "Zabbix Agent" -BinaryPathName '"C:\Program Files\Zabbix\bin\win64\zabbix_agentd.exe" --config "C:\Program Files\Zabbix\conf\zabbix_agentd.conf"' `
+ -DisplayName "Zabbix Agent" -Description "Provides system monitoring" -StartupType "Automatic" -ErrorAction SilentlyContinue
 #Starting zabbix agent
 Get-service -name  "Zabbix Agent" | start-service