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Error code VAN -79 generally indicates an issue with the Riot Vanguard anti-cheat system. First, try restarting VALORANT and the Riot Client. If the issue persists, you may need to uninstall and then reinstall Riot Vanguard. Make sure no other software is conflicting with Vanguard by closing all unnecessary background programs. If the problem continues, you can try checking for any pending Windows updates or outdated drivers as these can occasionally cause compatibility issues.
For further assistance, you can visit the Riot Games Support site for more detailed troubleshooting steps:
VALORANT Riot Vanguard Support
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