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2 Answers

On startup, i get the message: Isass.exe - Access Denied

A process has requested access to an object, but has not been granted those access rights.

If I click OK or simply close the dialog box, the computer will try to re-start but post the same dialog box over and over, not allowing my computer to load windows.

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  • 5 more comments 
  • manny0103 Oct 28, 2008

    I have Windows XP Professional. My laptop's firewall is from Windows

  • manny0103 Oct 29, 2008

    Won't go thru via SAFE MODE or any option via F8. Windows won't load. Isass.exe Access Denied keeps popping back.

  • manny0103 Oct 29, 2008

    Operating System: Microsoft Windows XP Professional

  • manny0103 Oct 30, 2008

    I only have one floppy disc drive in my laptop, so can I do the following instead:

    1. Copy a good lsass.exe into a USB?

    2. Plugin the USB in my laptop and also insert Windows XP in my floppy disc drive.

    3. Startup my laptop and run it through SETUP

    4. Select REPAIR, enter admin password to bring me to DOS Prompt

    5. Copy Windows XP to C;\Windows\system32

    6. Enter EXIT

    7. Restart the laptop

    Kindly confirm if this is the way to go. Thanks.

  • manny0103 Oct 30, 2008

    after REPAIR, I got to the DOS PROMPT --- C:\WINDOWS>

    When I tried copying Windows XP to C:\WINDOWS\SYSTEM32

    1. I went to D drive where my Windows XP installation disc is

    2. type: copy c:\windows\system 32

    message appeared: copy does not support wildcards or directory copies

    What should I do?

  • Frank
    Frank May 11, 2010

    go to control panel>users accounts and verify you are the local administrator.

    sound like you are a user not a administrator.

    what is the object the windows try to access????

  • Frank
    Frank May 11, 2010

    what operting system?



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Looks like the windows login authentication having a problem authenticate your login.
go to "safe mode with network connection" and check the laptop for virus. go to Trendmicro and get the house call (online virus scan).
option is copy a good lsass.exe from another laptop or desktop pc and replace it.

"lsass.exe" is the Local Security Authentication Server. It verifies the validity of user logons to your PC/Server. It generates the process responsible for authenticating users for the Winlogon service. This process is performed by using authentication packages such as the default Msgina.dll. If authentication is successful, Lsass generates the user's access token, which is used to launch the initial shell. Other processes that the user initiates inherit this token. More info
Note: The lsass.exe file is located in the folder C:\Windows\System32. In other cases, lsass.exe is a virus, spyware, trojan or worm!

Posted on Oct 29, 2008

  • Frank
    Frank Oct 30, 2008


    here is something you can do.

    if you have the Windows Xp CD, that will be good.

    (NOTE: Following porcedure are in DOS format. everything are done via keyboard, mouse is disabled).

    First, copy a good "lsass.exe" from a working PC. put it on a floppy disk (if you still have one), if not, then you need to get an external one using USB. plugin the laptop, then startup the laptop. (do not connect USB after the laptop is up, it will see the usb.)

    second, if you are using the external floppy, you need to connect it first before turn on the laptop.

    startup the laptop with the Windows XP, let it run through the setup, till it ask you to "install Windows XP or Repair". select repair, enter local administor password. this will bring you to DOS prompt. you will have access to all of the drives. copy the file from Floppy to C:\windows\system32

    enter exit, and restart the laptop. you should be able to gain access to the operting system.

  • Frank
    Frank Oct 30, 2008

    I don't think the USB will work, but if it works that is great.

    you have copy the full path:

    ex: copy a:\lsass.exe c:\windows\system32\lsass.exe

    that is only way it will work. Windows Xp DOS is not the same as DOS 6.22 (last full DOS version).

    good luck! you almost there!



Information on lsass.exe -

Are you running a firewall (such as zonealarm)? It might be your firewall may be blocking a legit attempt by lsass.exe to run. You may have to add this to your firewall's allowed list. Of course if you are not running a firewall or if your firewall is already set to allow lsass you may have even greater problems.

You may want to post more information to get a better answer on this.

Posted on Oct 28, 2008


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isass.exe is registered as the Optix.Pro virus which carries in it's payload, the ability to disable firewalls and local security protections, and a backdoor capability

How Do You Remove Isass.exe Files in Windows XP and Vista:
  1. Click your Windows Start menu, and from “Search,” click “For Files and Folders….”
  2. A speech bubble will pop up asking you, “What do you want to search for?” Click “All files and folders.”
  3. Type a Isass.exe file in the search box, and select “Local Hard Drives.”
  4. Click “Search.” Once the file is found, delete it.
How to stop Isass.exe processes:
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  2. Type taskmgr.exe into the the Run command box, and click “OK.” You can also launch the Task Manager by pressing keys ALT + CTRL + DELETE or CTRL + Shift + ESC.
  3. Click Processes tab, and find Isass.exe processes.
  4. Once you’ve found the Isass.exe processes, right-click them and select “End Process” to kill Isass.exe.
How to remove Isass.exe registry keys: (Do not delete anything other than what is listed below.)
  1. Select your Windows menu “Start,” and click “Run.” An “Open” field will appear. Type “regedit” and click “OK” to open up your Registry Editor.
  2. Registry Editor will open as a window with two panes. The left side Registry Editor’s window lets you select various registry keys, and the right side displays the registry values of the registry key you select.
  3. To find a registry key, such as any Isass.exe registry keys, select “Edit,” then select “Find,” and in the search bar type any of Isass.exe’s registry keys.
  4. As soon as Isass.exe registry key appears, you can delete the Isass.exe registry key by right-clicking it and selecting “Modify,” then clicking “Delete.”
How to delete Isass.exe DLL files:
  1. First locate Isass.exe DLL files you want to delete. Open your Windows Start menu, then click “Run.” Type “cmd” in Run, and click “OK.”
  2. To change your current directory, type “cd” in the command box, press your “Space” key, and enter the full directory where the Isass.exe DLL file is located. If you’re not sure if the Isass.exe DLL file is located in a particular directory, enter “dir” in the command box to display a directory’s contents. To go one directory back, enter “cd ..” in the command box and press “Enter.”
  3. When you’ve located the Isass.exe DLL file you want to remove, type “regsvr32 /u SampleDLLName.dll” (e.g., “regsvr32 /u jl27script.dll”) and press your “Enter” key.
That’s it. If you want to restore any Isass.exe DLL file you removed, type “regsvr32 DLLJustDeleted.dll” (e.g., “regsvr32 jl27script.dll”) into your command box, and press your “Enter” key.
Did Isass.exe change your homepage?
  1. Click Windows Start menu > Control Panel > Internet Options.
  2. Under Home Page, select the General > Use Default.
  3. Type in the URL you want as your home page (e.g., “”).
  4. Select Apply > OK.
  5. You’ll want to open a fresh web page and make sure that your new default home page pops up.
Block Isass.exe sites:
Stop Isass.exe processes:
Get rid of Isass.exe DLLs: %PROGRAM_FILES%\ eKerberos\ Hook.dll
Delete Isass.exe folders: %PROGRAM_FILES%\ eKerberos\

Please rate this a fixya

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Isass.exe-access denied

go to start/run,then type the start up button and uncheck the lsass.exe...........simple as that amigo

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