Modern PC games rely heavily on advanced CPU instructions and updated system components to run correctly. Starfield is no exception. One error that has confused many players is Error Code 0xc000001d, which usually appears when launching the game and prevents it from starting at all.
If you’re seeing Starfield Error 0xc000001d on Windows 11, don’t worry—this is a well-known compatibility issue, not a broken installation or corrupted game files. In this in-depth guide, we’ll explain why this error occurs and walk you through all working fixes, step by step.
What Is Starfield Error 0xc000001d?
Error 0xc000001d is a Windows illegal instruction error. In simple terms, it means the game is trying to use a CPU instruction that your system does not support or cannot execute properly.
This error typically occurs:
- Immediately after clicking Play
- Before the Starfield splash screen appears
- Without any detailed in-game error message
Why Starfield Shows Error 0xc000001d
The most common causes include:
- CPU does not support required instruction sets (especially AVX / AVX2)
- Virtualization or Hyper-V conflicts
- Outdated Windows 11 build
- Corrupted Visual C++ Redistributables
- Running the game on unsupported or older hardware
- BIOS settings disabling required CPU features
Among these, missing CPU instruction support is the #1 cause.
Fix Starfield Error 0xc000001d on Windows 11
Follow the solutions below in order. You may not need to try every step.
1. Check If Your CPU Supports AVX and AVX2 (Critical Step)
Starfield requires modern CPU instruction sets.
- Press Windows + R, type
msinfo32, and press Enter. - Note your Processor model.
- Check the CPU specifications on the manufacturer’s website.
Your CPU must support AVX and AVX2.
If your CPU does not support these instructions, Starfield will not run, regardless of settings or updates.
There is no software workaround for missing AVX support.
2. Enable AVX and CPU Features in BIOS
Some systems support AVX but have it disabled.
- Restart your PC and enter BIOS/UEFI (usually Del, F2, or F10).
- Go to Advanced, CPU Configuration, or Advanced BIOS Features.
- Make sure options such as:
- AVX
- Advanced Vector Extensions
- CPU Enhanced Features
are Enabled.
- Save changes and exit BIOS.
After rebooting, try launching Starfield again.
3. Disable Hyper-V and Virtualization Features
Virtualization can interfere with AVX execution in some setups.
- Press Windows + R, type
optionalfeatures, and press Enter. - Uncheck:
- Hyper-V
- Virtual Machine Platform
- Windows Hypervisor Platform
- Click OK and restart your PC.
This fix has helped many users launch Starfield successfully.
4. Update Windows 11 Completely
Starfield relies on newer Windows components.
- Open Settings → Windows Update.
- Click Check for updates.
- Install all available:
- Cumulative updates
- Security updates
- Restart your PC.
Running an outdated Windows build can trigger instruction-related launch failures.
5. Repair or Reinstall Visual C++ Redistributables
Corrupted runtime libraries can cause 0xc000001d errors.
- Open Settings → Apps → Installed apps.
- Find all Microsoft Visual C++ Redistributable entries.
- Select each one and choose Repair.
If repair doesn’t work:
- Uninstall them.
- Download the latest Visual C++ Redistributables from Microsoft.
- Reinstall and restart your PC.
6. Verify Starfield Game Files
If files are damaged, the game may crash on startup.
- Open your game launcher (Steam or Xbox App).
- Go to Starfield → Properties.
- Select Verify integrity of game files.
- Wait for the scan to complete.
Corrupted executables can trigger illegal instruction errors.
7. Update Graphics and Chipset Drivers
Outdated drivers can contribute to launch failures.
- Open Device Manager.
- Update:
- Graphics drivers
- Chipset drivers
- Prefer downloading drivers directly from:
- GPU manufacturer
- PC or motherboard manufacturer
Restart after updating.
8. Remove Overclocks (CPU or RAM)
Aggressive overclocking can cause instruction execution failures.
- Enter BIOS/UEFI.
- Reset CPU and RAM settings to Default.
- Disable XMP temporarily if enabled.
- Save and reboot.
Try launching Starfield again with stock settings.
9. Run Starfield as Administrator
Permission-related issues can sometimes trigger crashes.
- Right-click the Starfield executable.
- Select Run as administrator.
This is a minor fix but worth testing.
Wrapping Up
Starfield Error 0xc000001d on Windows 11 is almost always caused by missing or disabled CPU instruction support, especially AVX and AVX2. By verifying your CPU capabilities, enabling required BIOS features, disabling Hyper-V, updating Windows, and repairing runtime libraries, you can resolve the issue in most supported systems.
If your CPU does not meet Starfield’s minimum instruction requirements, the error is expected behavior—not a bug. In that case, upgrading your hardware is the only permanent fix.
