smss.exe is a program which is probably NOT a virus or malware. So, if smss.exe is on your PC, it is probably ok, and will NOT cause problems. Even if your system is clean, we still advise you to purchase a well-known antivirus with a good track record, in order to yourself your system against viruses and malware.
Normally, this program is stored in C:\Windows\System32\smss.exe.
The MD5 fingerprint for this executable is 40f6e4aafc115348c080f7a160c7fb36.
This application is NOT registered as a Windows service. This is very good.
smss.exe seems to have something to do with Windows SFC (System File Checker) or Windows File Protection.
This is a 64-bit executable. It uses the full capacity of nowadays' computer processors.
smss.exe has a digital signature. Today most clean software applications are digitally signed.
The digital signature extracted from smss.exe verifies as ok. This is most likely a clean, ok program.
Digitally signed by: Microsoft Windows
Certificate's issuer name: Microsoft Windows Verification PCA
This executable does NOT have an uninstall routine set up in registry.