vgk.sys
Riot Games — Riot Vanguard anti-cheat (Valorant, League of Legends)
When blamed in a crash: Very likely the true cause
What to do
Riot's kernel anti-cheat. When vgk.sys appears in a crash, reinstalling Vanguard fixes most cases.
- Uninstall Riot Vanguard (Windows Settings → Apps), then launch the Riot game — it reinstalls Vanguard fresh.
- Make sure Windows is fully updated first; Vanguard is sensitive to core-isolation/virtualization settings.
- If crashes continue, report to Riot support with your dump — conflicts with other kernel drivers are their territory.
Official download (the vendor's own site — never use third-party "driver download" sites):
https://support-valorant.riotgames.com/hc/en-us
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