tray.exe also is a process belonging to a homepage hi-jacker application. It will replace your default homepage with an adult website. This process should be removed to ensure your personal privacy. This process is a security risk and should be removed from your system. Please see additional details regarding this process. this process.
Non-system processes like tray.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.
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.