The main cause is turning on Hyper-V or Virtual Machine Platform in the BIOS or Windows features on hardware that is not fully compatible; other causes include firmware bugs, IOMMU problems, and fast boot problems.
1. Uninstall Trusteer Rapport (or similar application)
I know this might seem like an unlikely culprit, but many users using security apps recommended by banks have found that the app responsible for preventing Windows 11 from booting is Trusteer Rapport. There might be other similar apps causing the same issue, but so far Trusteer Rapport is most often blamed. Unfortunately, if you’re very dependent on Trusteer Rapport, there isn’t a reliable way yet to keep both the app and virtualization enabled at the same time — it’s either one or the other. If you want to keep virtualization enabled, the only way to allow your Windows 11 computer to boot is to uninstall the conflicting software. Note: It’s possible that a different app using similar security techniques is causing this behavior. If you have a suspect, uninstall it as shown below for Trusteer Rapport.
2. Fix the Boot Repair Loop
Unfortunately, the notorious issue that plagued previous Windows versions (Boot Repair Loop) is back in Windows 11. Apparently, when you enable Hyper‑V to use features like Core Isolation, there’s a small chance an important flag will be set to AUTO, which causes the Boot Repair Loop. Resolving this is the same as before — you’ll need to boot in Safe Mode, then set HyperVisorLaunchType to OFF before rebooting.
3. Use a healthy System Restore point
If the methods above were not effective in your case, one last thing you can try before refreshing every system file is to restore a healthy System Restore snapshot using the System Restore utility. If the problem is related to a recent system change that caused a conflict with virtualization, this will likely fix it.
4. Perform a Repair install
If you’ve come this far, the best option is to replace the Windows system files to resolve any corruption that might be causing issues with Hyper‑V virtualization. You can always clean install Windows 11, but a better approach is to perform a repair install (in‑place upgrade) — this lets you keep all your personal files, apps, and documents that are stored locally. Only the Windows 11 system files are replaced.
