WUSA.exe

Windows Update Standalone Installer.

Syntax
 WUSA path_to_MSU_file [/quiet]
 [/norestart] [/warnrestart:seconds] [/promptrestart] [/log:file_name]
 WUSA /uninstall path_to_MSU_file [/quiet]
 [/norestart] [/warnrestart:seconds] [/promptrestart] [/log:file_name]
 WUSA /uninstall /kb:KB_number [/quiet]
 [/norestart] [/warnrestart:seconds] [/promptrestart] [/log:file_name]
 WUSA /? | /h | /help
Options:
 /kb:##### Uninstall a package led by using its KB number. Use only together with /uninstall.
 /quiet Run Wusa.exe in quiet mode without user interaction.
 This option has been deprecated, uninstalling updates quietly could be a security risk
 because malicious software could quietly uninstall an update in the background
 without user intervention.
 /norestart Prevent Wusa.exe from restarting the computer.
 The /norestart switch is ignored if the /quiet switch is not present.
 If you run Wusa.exe together with these two switches, you must manually restart the
 Operating System after the installation is complete (if the installation requires a restart)
 For example, if the Windows6.0-KB934307-x86.msu file is in the D:934307円 folder, type
 the following command to install the update package:
 wusa.exe D:934307円\Windows6.0-KB934307-x86.msu /quiet /norestart
 /warnrestart:seconds
 When this switch is combined with the /quiet switch, Wusa.exe prompts you before it
 begins a restart for install and uninstall operations.
 /promptrestart
 When this switch is combined with the /quiet switch, Wusa.exe will prompt before
 initiating a restart.
 /forcerestart
 When this switch is combined with the /quiet switch, Wusa.exe forcibly closes
 applications and then begins a restart.
 /uninstall /kb:#####
 Uninstall an update.
 /?, /h, /help View help.

The wusa usage to quietly uninstall an update has been deprecated. (wusa.exe /uninstall /kb:####### /quiet )
The uninstall command with /quiet switch fails with event ID 8 in the Setup event log. Uninstalling updates quietly could be a security risk because malicious software could quietly uninstall an update in the background without user intervention.

On sites where WSUS is enabled, you may sometimes need to temporarily revert to Windows Update (0) in place of the WSUS server (1).

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU

Value name: UseWUServer
value = 0 to use a Windows Update server.
value = 1 to use a local server that is running Software Update Services.

Restart the Windows Update Service to ensure the changes take effect:

NET stop wuauserv
NET start wuauserv

Examples

Install a package:

C:\> WUSA.exe d:934307円\Windows6.0-KB934307-x86.msu /quiet

Install a package but do not restart:

C:\> WUSA D:934307円\Windows6.0-KB934307-x86.msu /quiet /norestart

Remove a package but do not restart:

C:\> WUSA /uninstall /kb:934307 /norestart

"A scar does not form on the dying. A scar means I survived" ~ Chris Cleave

Related commands

EXPAND - Uncompress CAB/MSU files.
DISM - Operating System Package Servicing.
WUAUCLT - Windows Update Agent.
%systemroot%\WindowsUpdate.log
Q934307 - Description of the Windows Update Standalone Installer.
Q824687 - Command-line switches for Microsoft software update packages.
WUshowhide.diagcab - Show/Hide selected Windows updates, direct link to utility.