Easy Anti Cheat Untrusted system file (\\?GlobalROOT\Device\HarddiskVolume5\Windows\System32\amdihk64.dll

Question

Easy Anti Cheat Untrusted system file (\\?GlobalROOT\Device\HarddiskVolume5\Windows\System32\amdihk64.dll

Elijah Dowdy 5

Recently Bought Master Chief Collection on steam, played for years on this pc through gamepass/Xbox App. I can't access any online features, and it says its "Contacting Severs" but it never connects. So far I have:

-Restarted PC

-Reinstalled Halo Master Chief Collection

-Reinstalled/Updated Drivers

-Validated Files through Steam

-used command prompt sfc /scannow to repair any damaged files that steam validation maybe couldn't catch

I just got it so i dont have mods downloaded at all no workshop items from steam nothing. HOWEVER i do have the seamless-coop mod for elden ring idk if that would conflict

Garp 0 Reputation points

2026-03-30T01:50:22.82+00:00

Did you ever figure it out?

2 answers

Your answer

Garp 0 Reputation points

2026-03-30T01:50:22.82+00:00

Did you ever figure it out?

Answer 1

Carl-L 20,295 Microsoft External Staff Moderator

Hello Elijah Dowdy,

Welcome to Microsoft Q&A forum.

May I know if you have had the chance to check out the AI assistant suggestion yet? If you did, may I know how it goes?

Before we process further, may I know if this also happens in any other games? Especially in the Halo franchise?

I'm waiting for your reply.

Carl-L 20,295 Reputation points Microsoft External Staff Moderator

2026-04-02T10:19:47.5733333+00:00

Hello Elijah Dowdy,

Just checking in to make sure that you have received my reply. Please let me know if you have any updates.
Erik Poya 0 Reputation points

2026-04-03T09:31:37.71+00:00

I'm having this same issue but for apex legends instead of halo, I have tried everything that the ai recommended and the issue is still present.
Carl-L 20,295 Reputation points Microsoft External Staff Moderator

2026-04-03T12:59:45.3666667+00:00

Hello Erik Poya,

Thanks for letting me know.

Just want to check one more thing, do you have the issue playing online with any other games that don't run the same anti cheat system. Also, did you try to reinstall the anti cheat to see if it helps?
Erik Poya 0 Reputation points

2026-04-04T06:11:00.97+00:00

No this is the only game that has given me this issue, Yes I have uninstalled/reinstalled eac and the issue still persists
Carl-L 20,295 Reputation points Microsoft External Staff Moderator

2026-04-07T09:59:26.9766667+00:00

Hello Erik Poya,

Disclaimer: Let’s try performing an in-place install or in-place upgrade which will refresh your Windows files and operating system without removing files or applications. That being said, we always recommend that if you have important data, you should back it up before making large system changes. If you want to back up your data first, please do so. Once you are done backing up, you can follow the steps in the following guides: How to run In-place upgrade in Windows 11 - Microsoft Community

Answer 2

Easy Anti-Cheat is blocking the game because it sees amdihk64.dll as an untrusted system file. This is typically an AMD driver/overlay component, and EAC will refuse to go online if any hooked DLL looks modified, injected, or incompatible.

Since the issue is with an anti-cheat driver and system integrity, focus on drivers and Windows security features rather than the game itself.

Update or reinstall AMD graphics drivers
- Completely remove current AMD GPU drivers using AMD’s cleanup utility or the standard uninstall from Settings → Apps → Installed apps → AMD Software.
- Reboot.
- Install the latest WHQL AMD driver package for the GPU from the vendor.
- Reboot again and try launching Halo MCC.
Check for blocked or incompatible drivers (Memory Integrity)
- In Windows 11, go to Start → Settings → Update & Security → Windows Security → Device Security → Core isolation details.
- If Memory Integrity is On and shows any blocked drivers related to AMD or Easy Anti-Cheat, install updated drivers first.
- If no compatible driver exists and online play is impossible otherwise, temporarily turn Memory Integrity Off and restart. Note that this reduces protection; only do this if necessary and consider turning it back on once a fixed driver is available.
Repair system files and component store
- Already ran sfc /scannow. Next, run DISM to repair the Windows image:
```
     DISM /online /cleanup-image /restorehealth
```
- Reboot after it completes and test the game again.
Remove or disable other anti-cheat or overlay tools
- Uninstall or temporarily disable other anti-cheat systems (for example, Easy Anti-Cheat from other games, BattlEye, or similar) if they install kernel drivers that might conflict.
- Close overlays and injectors (GPU overlays, recording/streaming tools, performance overlays) before starting Halo MCC.
Check for leftover or suspicious software
- If any untrusted tools, mods, or cheat-related utilities were ever installed, fully remove them. EAC can flag even dormant or partially removed components.
- Run a full scan with Windows Security and a reputable antimalware tool to ensure no tampering with system DLLs.
Reinstall or repair Halo MCC’s Easy Anti-Cheat
- From the game’s install folder, run the Easy Anti-Cheat setup/repair executable for Halo MCC and choose Repair.
- Then restart the PC and try again.

If, after updating AMD drivers, repairing EAC, and ensuring Memory Integrity/driver compatibility is addressed, the error persists, collect the exact Easy Anti-Cheat error text and contact the game’s or EAC’s support with that information, as it may be a newly blocked driver version.

References: