01.Why does this happen?
Vanguard (Riot's Anti-Cheat) on Windows 11 requires the computer to prove it is "trusted" through hardware. To do this, it forces the use of TPM 2.0 (Trusted Platform Module) and Secure Boot. If one of these is turned off, the game won't open.
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02.Step 1: Check if your disk is GPT or MBR
Secure Boot ONLY works on GPT disks. If your Windows was installed in legacy mode (MBR), enabling Secure Boot will cause the PC to stop booting.
- Right-click the Start Menu > Disk Management.
- Right-click "Disk 0" (where Windows is) > Properties.
- Go to the Volumes tab.
- Check "Partition style":
- If it's GUID (GPT): Great, skip to Step 3.
- If it's MBR: STOP. You need to convert to GPT.
03.Step 2: Convert MBR to GPT (Without Formatting)
Windows 10/11 has a native tool for this.
- Hold Shift and click Restart.
- Go to Troubleshoot > Advanced Options > Command Prompt.
- Log in to your account.
- Type:
mbr2gpt /validate(Should say "Validation completed successfully"). - Type:
mbr2gpt /convert. - When finished, restart and IMMEDIATELY enter the BIOS.
04.Step 3: Configuring the BIOS (Secure Boot + TPM)
Each brand is different, but the names are similar.
- Restart the PC while pressing Del or F2 to enter the BIOS.
- Disable CSM Support (Compatibility Support Module). Secure Boot only appears if CSM is OFF.
- Look for Secure Boot. Change to Enabled.
- ⚠️ If you get the error "System is in Setup Mode", look for "Key Management" or "Restore Factory Keys" and execute it. The Secure Boot Mode should be "User", not "Setup".
- Look for TPM:
- Intel: It's called IPTT or Intel Platform Trust Technology.
- AMD: It's called fTPM or Firmware TPM.
- Enable.
- Save and Exit (F10).
A1.Error: 'This build of Vanguard requires compliance...'
VBS and Core Isolation
Sometimes it's not the BIOS, it's Windows. Vanguard needs certain security services to be running.
- Search Windows for
msinfo32. - See "Virtualization-based security". It must be "Running".
- If it's not, search Windows for "Core Isolation" and enable "Memory Integrity". (Warning: This may slightly decrease FPS, but is required by Valorant in some cases).
Windows 10 vs Windows 11 in Valorant
If nothing works, know that this strict TPM + Secure Boot requirement is exclusive to Windows 11. On Windows 10, Valorant runs without TPM and without Secure Boot (in most cases). The "nuclear" solution is to go back to Windows 10.
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Written by a verified expert
Douglas Felipe M. Gonçalves
Expert in Windows system optimization with years of experience in hardware diagnostics, kernel tuning, and advanced technical support. Founder of Voltris and developer of the Voltris Optimizer.
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By following this guide on How to Fix Error VAN 9003 and VAN 1067 in Valorant: BIOS and TPM 2.0 Guide, you are equipped with the verified technical knowledge to solve this issue with confidence.
If you still have difficulties after following all steps, our expert support team is available for a personalized remote diagnosis. Every system is unique and may require a specific approach.