How to fix vac authentication error (Tutorial)

All of the steps below + more info!: How to verify integrity of game cache for CSGO: Steam ➣ Libary ➣ Right Click CSGO ➣ Properties ➣ Local Files ➣ Verify integrity of game cache How to repair steam: Exit steam first! Windows Start ➣ Seach "commandprompt"(without ") ➣ Right click and run as administrator ➣ write in the commandprompt ""C:\Program Files (x86)\Steam\bin\SteamService.exe" /repair" Now start csgo and try join a secure server(Private match etc). How to scan system: Windows start ➣ Seach "Commandprompt" ➣ right click and start as administrator ➣ write "sfc /scannow" after scan restart computer and try csgo Steam support page: https://support.steampowered.com/kb_article.php?ref=2117-ilzv-2837 (If none of these things work, contact steam support! Background music: https://www.youtube.com/playlist?list=PLAmr5JXNtiWygpjEzQOMzfT_dq7jOJYLe