Microsoft USB Serial Driver (usbser) Service Defaults in Windows 11
Default Settings
| Startup type: | Manual |
| Display name: | Microsoft USB Serial Driver |
| Service name: | usbser |
| Service type: | kernel |
| Error control: | normal |
| Path: | %SystemRoot%\System32\drivers\usbser.sys |
| Registry key: | HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\usbser |
Default Behavior
Microsoft USB Serial Driver is a kernel driver. In Windows 11 it starts only if the user, an application or another service starts it. If Microsoft USB Serial Driver fails to start, the failure details will be recorded into Event Log. Then Windows 11 should boot up and notify the user about the usbser service startup failure.
Restore Default Startup Configuration of Microsoft USB Serial 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 usbser start= demand
3. Close the command window and restart the computer.
The usbser service is using the usbser.sys file that is located in the C:\Windows\System32\drivers directory. If the file is removed or corrupted, read this article to restore its original version from Windows 11 installation media.