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The blue screen error with the stop code SYSTEM THREAD EXCEPTION NOT HANDLED, specifically referencing the file Qcamain10x64.sys, is typically caused by a problem with the Qualcomm Atheros Wireless LAN (Wi-Fi) network adapter driver. This driver file helps your computer communicate with a wireless network.
Common Causes
Outdated, corrupted, or incompatible Wi-Fi drivers.
A recent Windows update or a new driver installation that conflicts with existing hardware or software.
Hardware issues with the wireless adapter itself.
Antivirus or anti-cheat software that flags the driver as a security violation.
Troubleshooting Steps
To fix this issue, you will likely need to access the Windows Recovery Environment (WinRE) or Safe Mode, as the error might prevent you from booting into Windows normally.
Boot into Safe Mode: Force your computer to shut down twice by holding the power button. On the third boot, it should enter WinRE. Navigate to Troubleshoot > Advanced options > Startup Settings, and then restart. Press F5 to enable Safe Mode with Networking.
Update the Driver:
Once in Safe Mode, right-click the Start menu and open Device Manager.
Expand the Network adapters section, locate the Qualcomm Atheros Wireless LAN device, right-click it, and select Update driver.
Choose to Search automatically for drivers. If Windows doesn't find an update, visit your computer manufacturer's website to download the latest driver manually on another device and transfer it via USB.
Roll Back the Driver: If the error occurred after a recent update, use the same Device Manager steps but select Properties > Driver tab > Roll Back Driver (if the option is available).
Rename the Faulty File: If updating or rolling back is not possible, you can try renaming the file.
In Safe Mode, open File Explorer and go to C:\Windows\System32\drivers.
Find Qcamain10x64.sys, right-click it, and rename it to Qcamain10x64.sys.old.
Restart your computer to see if the issue is resolved. Windows may automatically install a generic driver.
Uninstall Conflicting Software: Consider temporarily uninstalling any recently installed antivirus or gaming-related anti-cheat software, as these can sometimes cause conflicts.
Check for Hardware Failure: If all software fixes fail, the Wi-Fi adapter hardware might be faulty. In this case, it is recommended to contact a local technician to physically check or replace the component.
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