csrss.exe is a program which is most likely NOT a virus or malware. So, if csrss.exe is on your PC, it is most likely ok, and will NOT be a cause for concern. Even if your PC is virus-free, it is still recommended to use a good antivirus with a good detection rate, in order to yourself your system against viruses and malware.
The default name and folder where the application is stored is
C:\WINDOWS\System32\csrss.exe.
The MD5 fingerprint for this file is 4e043fe41901f1ea1b0fccef3c077c56.
This application is NOT registered as a Windows service. This is good.
csrss.exe appears to use the functions of Windows SFC (System File Checker) or Windows File Protection.
64-bit code has been detected. This exe can exploit the full power of a modern computer processor.
csrss.exe has a digital signature. Today the large majority of legit programs are digitally signed.
The digital signature attached to csrss.exe is valid. This is very good.
Digitally signed by: Microsoft Windows Publisher
Certificate's issuer name: Microsoft Windows Production PCA 2011
This program does NOT have an uninstall command stored in registry.