Error code
Windows Code 40
WINDOWSCode 40
System Error Code· A POSIX/system errno returned when a system call fails.
What it means
Windows cannot access this hardware because its service key information in the registry is missing or recorded incorrectly. (Code 40).
How to fix it
- Open Device Manager.
- right-click the device and click Uninstall.
- click Action then Scan for hardware changes to reinstall the driver.
Not affiliated with Windows. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.
More Windows codes
- Code 1This device is not configured correctly. (Code 1)
- Code 10This device cannot start. (Code 10)
- Code 12This device cannot find enough free resources that it can use. (Code 12)
- Code 14This device cannot work properly until you restart your computer. (Code 14)
- Code 18Reinstall the drivers for this device. (Code 18)
- Code 19Windows cannot start this hardware device because its configuration information (in the registry) is incomplete or damaged. (Code 19)
- Code 21Windows is removing this device. (Code 21)
- Code 22This device is disabled. (Code 22)
- Code 24This device is not present, is not working properly, or does not have all its drivers installed. (Code 24)
- Code 28The drivers for this device are not installed. (Code 28)
- Code 3The driver for this device might be corrupted, or your system may be running low on memory or other resources. (Code 3)
- Code 31This device is not working properly because Windows cannot load the drivers required for this device. (Code 31)