Users get scared when unknown processes run in the background, If you’ve installed Windows live essentials, Microsoft Default Manager will be installed on your Computer and it will appear in the processes tab in the task manager.
If you’ve used Firefox to download and install live essentials, it will install Download Manager add-on for Firefox and it will appear in the startup programs list.
Microsoft Default Manager being installed and appears in ‘Program File’s under ‘Microsoft’ directory.
You can uninstall Microsoft Default Manager from add or remove programs in XP or from Programs and features in Windows 7. If you haven’t found the uninstaller, then delete the Default Manager folder mentioned above by booting into safe mode.