steam.exe is a application which is probably NOT a virus or malware. So, if steam.exe is on your computer, it is probably ok, and will NOT cause problems. Even if your system is virus-free, it is still recommended to run a good antivirus with a good detection rate, in order to defend yourself against viruses and malware.
This application is normally stored in C:\xxx\Steam.exe.
The MD5 fingerprint for this file is 2a91472c8408b31e9ebeecb31ff5ec6e.
This program does NOT run as a Windows service. This is normally a good sign.
This application runs as a 32-bit program. It can not benefit of the entire power of modern computer processors. This is quite normal because the authors did not upgrade it to use the x64 instruction set.
The description extracted from the exe is Steam Client Bootstrapper.
File version stored as a property 04.11.49.78.
Maker Valve Corporation.
Intellectual property rights notice Copyright (C) 2010 Valve Corporation.
steam.exe is digitally signed. Today the large majority of clean software applications are digitally signed.
The digital signature extracted from steam.exe checks out perfectly. This is very good.
Digital certificate name: Valve
Certificate's issuer name: DigiCert SHA2 Assured ID Code Signing CA
This program starts at your PC's startup. Yes
It has an uninstall string in registry, which is good. si are uninstall.