Windows 95 Setup Switches

Posted on 1998-10-03
Last Modified: 2013-12-16
Windows 95 has some setup switches that I don't understand. They are /D /P F /IW
I am getting ready to re-install Windows 95 and need to know what these switches do.
Question by:wsking

Accepted Solution

wayneb earned 50 total points
ID: 1758564

Here are the setup switches and summarys.

Windows 95 Setup Switches
Last reviewed: September 24, 1998
Article ID: Q128400
The information in this article applies to:
Microsoft Windows 95

This article describes the switches you can use with the Windows 95 Setup program.

The following switches can be added to the Setup command. For example,

   setup /?

/? - This switch provides a brief summary of the available Setup switches
      and the correct command line syntax.

/c - This switch causes Setup to not run SMARTDrive.
/d - If you do not want Setup to use your existing Windows configuration

      (such as your current Win.ini and System.ini files), use this

/id - If you do not want Setup to check for the minimum disk space
      required to install Windows 95, use this switch.

/it - If you do not want Setup to check for the presence of "dirty" or
      "deadly" terminate-and-stay-resident programs (TSRs) that are known
      to cause problems with Windows 95 Setup, use this switch.

/ih - This switch causes Setup to run ScanDisk in the foreground.
/iq - If you use the /is switch to bypass ScanDisk or ScanDisk fails,

Setup checks your drive for cross-linked files. Use the /iq switch
      to prevent Setup from doing this.

/is - This switch causes Setup to not run ScanDisk.
/l - Use this switch if you have a Logitech mouse and want it enabled

      during Setup.

You must run Setup from your previous version of MS-DOS or start Windows 95 in MS-DOS mode for these switches to function.
/n - This switch causes Setup to run without a mouse.

/p - The /p switch causes Setup to pass string(s) directly to Detection

     Manager (or Sysdetmg.dll). Setup does not interpret the content of
     the string. The string can contain one or more detection options.

     The /p switch is not to be used by itself. For more information on
     the /p switch, please see the "/p Detection Switch Option String
     Defined" section below.

-s - Use this switch to use an alternate Setup.inf file.
/t:<dir> - This switch lets you to specify where Setup will copy its

           temporary files. WARNING: Any existing files in this
           directory will be deleted.

/p Detection Switch Option String Defined
The string can contain one or more detection switches separated by a semicolon (;). For example, if you want to use "/p f" and "/p i" you type "setup /p f;i".
Some switches are simply On/Off switches. The absence of the switch implies Off; the presence of the switch turns it On. A minus sign (-) appended immediately after a switch turns it Off.
Some switches take parameters in the form of <c>=<params>. If there is more than one parameter to a switch, the parameters are separated by a comma (,).
There must not be any spaces in the detection option string.

Valid Detection Switches:
a - This switch enables safe detection. It tells each detection module

    to try safer detection methods. Safer detection methods may not
    detect devices correctly.

    The default during Setup is enabled. The default in other cases is

    Example: setup /p a

b - This switch enables Prompt Before mode. It prompts you before a
    detection module is called so that you can step through each
    detection module manually and decide if you want to skip it.

    The default is disabled.

    Example: setup /p b

c - This switch enables class detection. Class detection is a mechanism
    for finding hints for a certain class of devices. For example, adapter
    class detection looks for hints in the Config.sys and System.ini files
    for CD-ROM drivers. If it does not find any, Setup displays a CD-ROM
    check box asking if you have a CD-ROM drive.

    The default during Setup is enabled. The default when you use the
    Add New Hardware tool and docking/undocking detection is disabled.

    Example: setup /p c

c- - Setup /p c- disables safe class detection. For example, this switch
     tells Setup to always search on all network adapter cards, sound
     cards, and CD-ROM drives.

     Example: setup /p c-

d=<name> - This switch detects the listed detection modules only, where
           <name> is a detection module name or a device class name.

           Detection module names (such as DetectPIC and DetectAHA154x)
           are found in the Msdet.inf file. Device class names can be
           SCSIAdapter, net, and so on.

           Example: setup /p d=detectpic

e - This switch enables Setup mode detection.

    The default during Setup is enabled. The default in other cases is

    Example: setup /p e

f - This switch enables Clean Registry mode. It forces Detection to
    clean the root branch of the registry before starting. This switch
    is ignored when Setup is run in the Windows 95 graphical user
    interface (GUI).

    The default is disabled.

    Example: setup /p f

g=<n> - This switch specifies the verbose level, where <n> is 0 to 3.

        This switch controls how verbose the built-in progress bar is. At
        maximum level (3), it shows all the resources of the detected
        devices along with the progress bar. This switch can help to
        identify which detection module causes a certain problem. For
        example, if your mouse stops responding (hangs) during detection
        but the system continues, there is no way to determine from the
        log files which module hung the mouse. By turning this option on
        and constantly moving the mouse during Setup, you can determine
        which module is running when the mouse hangs.

        The default is disabled (0).

        Example: setup /p g=3

i - This switch tells Setup not to report the existence of a Plug and
    Play BIOS. It is useful on systems that have a Plug and Play BIOS
    that is not reported in Machine.inf.

    Example: setup /p i

j - This switch tells Setup to undo the results of the "Setup /p i"
    switch. This switch should only be used after a machine that
    required "Setup /p i" has updated their Plug and Play BIOS.

    Example: setup /p j

l=<n> - This switch specifies the logging level for Detlog.txt, where
        <n> is 0 to 3.

        The default is maximum logging (3).

        Example: setup /p l=0

m - This switch enables Mini-windows mode.

    This is enabled only when Setup is run under MS-DOS.

    Example: setup /p m

n - This switch enables No Recovery mode. This option can be used to
    turn off the Windows 95 Setup recovery mechanism (for example, this
    switch prevents the creation of the Detcrash.log file).

    The default is disabled.

    Example: setup /p n

o=<traceoutput> - This switch specifies the trace output. The information
                  is written to the Tracelog.txt file in the current

                  This option is available only in the Debug version of

                  Example: setup /p o

p - This switch enables performance logging. It writes performance
    timing information to the DETLOG.TXT file.

    The default is disabled.

    Example: setup /p p

r - This switch enables Recovery mode. It causes Detection to use the
    Detcrash.log file, if found, for recovery. If this switch is not
    enabled, Detection ignores and deletes Detcrash.log even if it is

    This switch is used if Safe Recovery is selected during Setup,
    otherwise it is not used.

    Example: setup /p r

s=<name> - This switch skips the listed detection modules or classes of
           detection modules, where <name> is a detection module name or a
           device class name.

           Detection module names (such as DetectPIC and DetectAHA154x)
           are in the Msdet.inf file. Device class names are SCSIAdapter,
           net, and so on.

           Example: setup /p s=detectpic

t=<n> - This switch specifies the trace level, where <n> is 0 to 9.

        The default is disabled (0).

        This option is available only in the Debug version of Sysdetmg.dll.

        Example: setup /p t=9

v - This switch enables Verify Only mode. Detection has two stages:

    1. Verify existing devices in the registry.

    2. Detect new devices.

    This switch tells Detection to perform only stage 1. This switch is
    used by the PCMCIA Wizard to verify legacy devices in the registry.

    The default is disabled.

    Example: setup /p v

x=<res list> - This switch excludes the listed resources from detection,
               where <res list> is one of four possibilities:

                - io(xxx-yyy,xxx-yyy,...)

                - mem(xxxxx-yyyyy,xxxxx-yyyyy,...)

                - irq(x,y,z,...)

                - dma(x,y,z,...)

                This switch protects resources so that no detection
                modules can access them.

                Example: setup /p x=io(300-30f,240-24f)

Good Luck


Author Comment

ID: 1758565
Keep up the good work.

Expert Comment

ID: 1758566
/iw - This switch causes Setup do not ask for licens aggrement

Featured Post

Do email signature updates give you a headache?

Do you feel like you are constantly making changes to email signatures? Are the images not formatting how you want them to? Want high-quality HTML signatures on all devices, including on mobiles and Macs? Then, let Exclaimer solve all your email signature problems today.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Sometimes drives fill up and we don't know why.  If you don't understand the best way to use the tools available, you may end up being stumped as to why your drive says it's not full when you have no space left!  Here's how you can find out...
Possible fixes for Windows 7 and Windows Server 2008 updating problem. Solutions mentioned are from Microsoft themselves. I started a case with them from our Microsoft Silver Partner option to open a case and get direct support from Microsoft. If s…
The Task Scheduler is a powerful tool that is built into Windows. It allows you to schedule tasks (actions) on a recurring basis, such as hourly, daily, weekly, monthly, at log on, at startup, on idle, etc. This video Micro Tutorial is a brief intro…
Get a first impression of how PRTG looks and learn how it works.   This video is a short introduction to PRTG, as an initial overview or as a quick start for new PRTG users.

930 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

8 Experts available now in Live!

Get 1:1 Help Now