By john 
Your PC shows a blue screen with the stop code BAD_SYSTEM_CONFIG_INFO, restarts, and may repeat the same crash during start-up. When Windows 10 bad system config info appears, Windows has slot88 found a problem with its configuration data, usually stored in the registry or the boot configuration.
The registry holds settings for Windows, drivers, and programs. The boot configuration data, called BCD, tells the PC how to start Windows. If either is damaged by a failed update, a sudden power cut, a faulty disk, or a careless registry edit, Windows can no longer trust its own settings.
Sometimes a recently installed driver or a change to memory settings in the BIOS triggers the same stop code.
Recovery tools built into Windows can repair most cases without reinstalling.
The error may appear only once after an update, or it may loop so Windows never reaches the desktop. Both cases use the same fixes, but a loop means working from the recovery menu.
Possible Causes
This blue screen has these common causes:
- Damaged registry files after a crash or power loss.
- Corrupted boot configuration data.
- A faulty or incompatible driver installed recently.
- Failing RAM or a storage drive with bad sectors.
Registry cleaner programs are a frequent trigger, because they remove entries Windows still needs.
A common example is an older PC where a BIOS setting for memory or storage was changed, after which Windows no longer matches what it remembers. Resetting the BIOS to defaults can clear the error in that case.
Quick Fixes to Try First
Undo recent changes.
- If Windows starts, uninstall any driver, update, or registry cleaner added just before the crashes.
- Restart the PC and check whether the crash returns.
- If Windows does not start, turn the PC off at the logo three times to open the recovery menu.
- Choose Troubleshoot > Advanced options > System Restore and pick a point from before the problem.
- Try Startup Repair from the same menu.
System Restore brings back older registry settings and often solves this error quickly.
Advanced Steps for Stubborn Cases
Repair boot and system files from Command Prompt in recovery.
- Open Troubleshoot > Advanced options > Command Prompt.
- Type bootrec /fixmbr, then bootrec /fixboot, then bootrec /rebuildbcd, pressing Enter after each.
- Type chkdsk C: /f to check the drive for errors.
- Restart and, if Windows loads, run sfc /scannow and DISM /Online /Cleanup-Image /RestoreHealth.
- Run Windows Memory Diagnostic to test the RAM.
If the drive or memory shows errors, replace the faulty part.
Before You Go Further: Keep Your Files Safe
Do not use registry cleaners to “fix” this error. If the PC will not start, copy important files using another PC or a bootable USB before trying a reset.
Conclusion
BAD_SYSTEM_CONFIG_INFO means Windows found damaged configuration data. Use System Restore, repair the boot data, check the drive and memory, and keep away from registry cleaners.