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Unable to access Task Manager - Error: Access is denied

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3 replies to this topic

#1 blue gravity

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Posted 16 November 2015 - 01:26 PM

Hello I am unable to access my task manager on Windows 7 as administrator. Whenever I try to access it a Command window flashes on the screen quickly and that's it. Same thing happens when taskmgr.exe is clicked. 


I was able to capture the command window error as the following:


C;\Users\<name>\Documents>REG and HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System  /v  DisableTaskMgr  /t  REG_DWORD  /d  /0  /f

ERROR: Access is denied.


Any help with this would be appreciated. I have checked that TaskMgr is enabled in the registry, and have ran AVG and Malwarebytes and they didn't come up with anything. 


Thanks again for any help on this one.

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#2 packetanalyzer


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Posted 16 November 2015 - 02:04 PM

blue gravity,
Please confirm that the command that is attempting to execute is the following:

REG add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableTaskMgr /t REG_DWORD /d 0 /f

This command is trying to enable task manager but the command prompt that is trying to enable task manager does not have the permissions to do that.


Please try the following:


  1. Click Start
  2. Type cmd
  3. Right click cmd.exe
  4. Select Run as administrator
  5. type "REG add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableTaskMgr /t REG_DWORD /d 0 /f"
  6. Press enter
  7. Close cmd.exe
  8. Log out
  9. Log in
  10. Try to open task manager


If this does not work, or you believe your computer might be infected, please follow the instructions found at Am I Infected, as I am not authorized to assist with the removal of malware.


Thank you,



Edited by packetanalyzer, 16 November 2015 - 02:06 PM.

#3 blue gravity

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Posted 16 November 2015 - 02:11 PM

Ok thanks for the info, that did not do the trick so moving to the infected forum.


Thanks again.

#4 hamluis



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Posted 16 November 2015 - 05:08 PM

OP reposted in AII, http://www.bleepingcomputer.com/forums/t/596543/unable-to-access-task-manager-error-access-is-denied/, there was requested to initiate new topic in MRL due to running ComboFix.


This topic is closed to avoid confusion.



Edited by hamluis, 16 November 2015 - 05:11 PM.

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