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Here is another trouble shooting guide from the Steam site:
https://support.steampowered.com/kb_article.php?ref=9828-SFLZ-9289
in Steam installation directory delete or rename clientregistry.blob and right click on the Steam.exe file and click "Run as administrator".
Windows Troubleshooting Steps
https://support.steampowered.com/kb_article.php?ref=4595-WEXN-6831&l=en
it can be your firewall/security tools...