This article provides information on why the message is displayed in the virtual machine event logs after every reboot.
Shutting down a Windows Guest operating system results in this EventID 1000 message:
The installed vmware-tools version in the guest determines whether autoupgrade can happen or not. There are cases where autoupgrade is not supported. For example, autoupgrade is not supported when a guest does not have vmware-tools running, or when vmware-tools are too old.
This message is a warning and can be safely ignored.