AutoUpdate.exe definition, relationships, removal:

AutoUpdate.exe is an executable file which primary purpose is to start a parasite or launch some of its components. Once executed, the AutoUpdate.exe file runs a process that is responsible for the parasite's payload. AutoUpdate.exe is a significant part of a dangerous threat, but it can also work on its own. DO NOT execute it!
The AutoUpdate.exe file is installed and used by adware AproposMedia and Envolo.
In some cases a presence of AutoUpdate.exe does not mean that your system is infected. The file may actually belong to some fully legitimate applications and therefore must stay intact. If you are in doubt, please scan the AutoUpdate.exe file using you regular spyware remover or antivirus program.