autoupdate.exe is a product of AT&T and is used for downloading software updates for their drivers. This program is non-essential process to the running of the system, but should not be terminated unless suspected to be causing problems.
Non-system processes like autoupdate.exe originate from software you installed on your system. Since most applications store data in your system's registry, it is likely that your registry has suffered fragmentation and accumulated invalid entries which can affect your PC's performance. It is recommended that you check your registry to identify slowdown issues.
Why do I have multiple instances of autoupdate.exe?
Multiple copies of a process in your task manager may indicate the presence of a virus or Trojan. Make sure you always use an updated antivirus software and perform a full scan to identify any such cases.
autoupdate.exe is known to have 2 other instances: