If the TaskCentre service fails to start with a logon failure error, this means the Windows account assigned to run the service can't authenticate.
Check the **Log On As** column in the Services list to see which Windows account is assigned to the service. By default, the Access TaskCentre service logs on as Local System, but this may have been configured differently for your environment. Speak to your IT department — they'll need to apply the correct account details and restart the services.