Serial Port Driver Service Defaults in Windows 7

Serial Device Driver by Microsoft Corporation.

Default Settings

Startup type:Manual
Display name:Serial Port Driver
Service name:Serial
Service type:kernel
Error control:ignore
Group:Extended base
Path:%SystemRoot%\system32\DRIVERS\serial.sys
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Serial

Default Behavior

Serial Port Driver is a kernel device driver. In Windows 7 it won't be started if the user doesn't start it. If Serial Port Driver fails to load or initialize, Windows 7 startup continues without error messages. The failure details are being written into Event Log.

Restore Default Startup Configuration for Serial Port Driver

1. Run the Command Prompt as an administrator.

2. Copy the command below, paste it into the command window and press ENTER:

sc config Serial start= demand

3. Close the command window and restart the computer.

The Serial service is using the serial.sys file that is located in the %WinDir%\system32\DRIVERS folder. If the file is changed, damaged or deleted, you can restore its original version from Windows 7 installation media.