csrss.exe is a application which is probably legit. So, if csrss.exe is on your computer, it is probably ok, and will NOT be a cause for concern. Even if your system is virus-free, we still advise you to purchase a good antivirus with a good track record, in order to defend your PC against threats.
Usually, the default name and directory where this program is stored is
C:\Windows\System32\csrss.exe.
The MD5 fingerprint for this program is 77dbc745d957b4f0404ababc10696784.
This application does NOT operate as a Windows service. This is usually a good sign.
csrss.exe seems to use the functions of Windows SFC (System File Checker) or Windows File Protection.
64-bit code has been detected. This application can use the full power of a current PC processor.
csrss.exe is digitally signed. Today most serious programs are digitally signed.
The digital signature attached to csrss.exe verifies as ok. This is most likely a clean, ok program.
Digital certificate name: Microsoft Windows Publisher
Certificate's issuer name: Microsoft Windows Production PCA 2011
This executable does NOT have an uninstall routine set up in registry.