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https://support.steampowered.com/kb_article.php?ref=9828-SFLZ-9289
Anti-Virus Applications - Any Anti-Virus program could potentially block Steam and Steam game access, especially when not properly configured for use with Steam. Please make sure that Steam and all Steam games are listed as exceptions in these programs. If the issue persists, please try disabling or temporarily uninstalling the program to test the issue.
You did not answer my other question.
Operating system.
Microsoft has been around for a long time and has many different versions of an OS. What Windows do you have, please ?