The Start-OSUninstall cmdlet enables you to uninstall and roll back to a previously installed
version of Windows.
The Start-OSUninstall cmdlet is supported on Windows 11 client operating system only.
Examples
Example 1: Uninstall OS
Start-OSUninstall -Online
Uninstalls the operating system that is currently running on the local computer and rolls back to a
previously installed version of Windows.
Parameters
-LogLevel
Specifies the maximum output level shown in the logs.
The default log level is 3.
The accepted values are as follows:
1 = Errors only
2 = Errors and warnings
3 = Errors, warnings, and information
4 = All of the information listed previously, plus debug output
Parameter properties
Type:
LogLevel
Default value:
None
Accepted values:
Errors, Warnings, WarningsInfo, Debug
Supports wildcards:
False
DontShow:
False
Aliases:
LL
Parameter sets
(All)
Position:
Named
Mandatory:
False
Value from pipeline:
False
Value from pipeline by property name:
True
Value from remaining arguments:
False
-LogPath
Specifies the full path and file name to log to. If not set, the default is
%WINDIR%\Logs\Dism\dism.log. In Windows PE, the default directory is the RAMDISK scratch space
which can be as low as 32 MB. The log file will automatically be archived. The archived log file
will be saved with .bak appended to the file name and a new log file will be generated. Each time
the log file is archived the .bak file will be overwritten. When using a network share that is not
joined to a domain, use the net use command together with domain credentials to set access
permissions before you set the log path for the DISM log.
Parameter properties
Type:
String
Default value:
None
Supports wildcards:
False
DontShow:
False
Aliases:
LP
Parameter sets
(All)
Position:
Named
Mandatory:
False
Value from pipeline:
False
Value from pipeline by property name:
True
Value from remaining arguments:
False
-NoRestart
Suppresses the prompt to restart and also requires a manual restart.
Parameter properties
Type:
SwitchParameter
Default value:
None
Supports wildcards:
False
DontShow:
False
Parameter sets
(All)
Position:
Named
Mandatory:
False
Value from pipeline:
False
Value from pipeline by property name:
True
Value from remaining arguments:
False
-Online
Specifies that the action is to be taken on the operating system that is currently running on the
local computer.
Parameter properties
Type:
SwitchParameter
Default value:
None
Supports wildcards:
False
DontShow:
False
Parameter sets
Online
Position:
Named
Mandatory:
True
Value from pipeline:
False
Value from pipeline by property name:
True
Value from remaining arguments:
False
-Path
Specifies the full path to the root directory of the offline Windows image that you will service. If
the directory named Windows is not a subdirectory of the root directory, WindowsDirectory must be
specified.
Parameter properties
Type:
String
Default value:
None
Supports wildcards:
False
DontShow:
False
Parameter sets
Offline
Position:
Named
Mandatory:
True
Value from pipeline:
False
Value from pipeline by property name:
True
Value from remaining arguments:
False
-ScratchDirectory
Specifies a temporary directory that will be used when extracting files for use during servicing.
The directory must exist locally. If not specified, the \Windows\%Temp% directory will be used,
with a subdirectory name of a randomly generated hexadecimal value for each run of DISM. Items in
the scratch directory are deleted after each operation. You should not use a network share location
as a scratch directory to expand a package (.cab or .msu file) for installation. The directory used
for extracting files for temporary usage during servicing should be a local directory.
Parameter properties
Type:
String
Default value:
None
Supports wildcards:
False
DontShow:
False
Parameter sets
(All)
Position:
Named
Mandatory:
False
Value from pipeline:
False
Value from pipeline by property name:
True
Value from remaining arguments:
False
-SystemDrive
Specifies the path to the location of the BootMgr files. This is necessary only when the BootMgr
files are located on a partition other than the one that you are running the command from. Use
-SystemDrive to service an installed Windows image from a Windows PE environment.
Parameter properties
Type:
String
Default value:
None
Supports wildcards:
False
DontShow:
False
Parameter sets
(All)
Position:
Named
Mandatory:
False
Value from pipeline:
False
Value from pipeline by property name:
True
Value from remaining arguments:
False
-WindowsDirectory
Specifies the path to the Windows directory relative to the image path. This cannot be the full path
to the Windows directory; it should be a relative path. If not specified, the default is the Windows
directory in the root of the offline image directory.
Parameter properties
Type:
String
Default value:
None
Supports wildcards:
False
DontShow:
False
Parameter sets
(All)
Position:
Named
Mandatory:
False
Value from pipeline:
False
Value from pipeline by property name:
True
Value from remaining arguments:
False
CommonParameters
This cmdlet supports the common parameters: -Debug, -ErrorAction, -ErrorVariable,
-InformationAction, -InformationVariable, -OutBuffer, -OutVariable, -PipelineVariable,
-ProgressAction, -Verbose, -WarningAction, and -WarningVariable. For more information, see
about_CommonParameters.