csrss.exe is a process which is registered as a trojan.
"This Trojan allows attackers to access your computer from remote locations, stealing passwords, Internet banking and personal data. "
This process is a security risk and should be removed from your system.
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Non-system processes like csrss.exe originate from software you installed on your system. Since most applications store data in your system's registry, it is likely that over time your registry suffers fragmentation and accumulates invalid entries which can affect your PC's performance. It is recommended that you check your registry to identify slowdown issues.
In order to ensure your files and data are not lost, be sure to back up your files online. Using a cloud backup service will allow you to safely secure all your digital files. This will also enable you to access any of your files, at any time, on any device.
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.