Mount Point Manager (mountmgr) Service Defaults in Windows 7

Driver responsible with maintaining persistent drive letters and names for volumes.

Default Settings

Startup type:Boot
Display name:Mount Point Manager
Service name:mountmgr
Service type:kernel
Error control:critical
Group:System Bus Extender
Path:%SystemRoot%\System32\drivers\mountmgr.sys
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\mountmgr

Default Behavior

Mount Point Manager is a kernel device driver. In Windows 7 it is being loaded by Boot Loader before Kernel initialization. If Mount Point Manager fails to load, Windows 7 attempts to write the error data into Event Log and restart the computer, using the Last Known Good configuration. If the Last Known Good configuration is not valid, Windows 7 startup ends with a Stop error. If you remove or disable the mountmgr service, Windows 7 won't start.

Restore Default Startup Configuration for Mount Point Manager

1. Run the Command Prompt as an administrator.

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

sc config mountmgr start= boot
sc start mountmgr

3. Close the command window and restart the computer.

The mountmgr service is using the mountmgr.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.