Microsoft Security Essentials includes a command-line utility which can be used to update the virus/malware definitions, initiate a scan, undo a recent definition update and perform other tasks. To know how to use the command-line utility, open a Command Prompt window (CMD.EXE) and execute the following command:
|-? / -h||Displays all available options for this tool.|
|-Trace [-Grouping #] [-Level #]||Starts diagnostic tracing|
|-RemoveDefinitions [-All]||Restores the installed signature definitions to a previous backup copy or to the original default set of signatures|
|-RestoreDefaults||Resets the registry values for Microsoft Antimalware Service settings to known good defaults|
|-SignatureUpdate [-UNC]||Checks for new definition updates|
|-Scan [-ScanType]||Scans for malicious software|
|-Restore -Name <name> [-All]||Restore the most recently or all quarantined item(s) based on name|
|-GetFiles||Collects support information|
In addition to the above information, detailed information for each command-line parameter is shown when you run the above command.
To update the MSE virus/malware definitions, use this command:
The command-line tool can be useful if you want to update MSE using Batch file, Script or using Task Scheduler.