wininetd.exe is added to the system as a result of the WINET virus.
It is a backdoor Trojan horse that will install itself in the System directory and automatically receive instructions from an online location. This process is a security risk and should be removed from your system.
If found on your system make sure that you have downloaded the latest update for your antivirus application.
Non-system processes like wininetd.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