Why I'm unable to access task manager in windows 7, 8?

Registry Editor is an inbuilt Windows tool that is used to modify registry keys which tell Windows how it should work. A simple registry modification can be used to bypass the Task Manager block. To do so, just follow the steps:-

1. Click on Start. Go to Run. If you use Windows8, Windows7 or Windows Vista, go to Search.
2. Type regedit and press Enter. Registry Editor will start. If Registry Editor is also disabled, you will first need to enable registry editing.
3. Through the left hand navigation pane, navigate to HKEY_CURRENT_USER\Software\Microsoft\ Windows\ Current Version\Policies\System. If the System key is not there, you will need to create it.
4. In the work area, locate "DisableTaskMgr". If this value is not there, you will need to create a new DWORD value called EnableTaskMgr. Double click on it. A window will pop up.
5. Enter its value data as0 and press OK.
6. Close Registry Editor. If Task Manager is still disabled, restart your computer.

- If  your not administrator in your PC PLEASE ask them first

- if its your personal PC Please chk your antivirus or spyware first.

There might be2 possible reasons behind this problem:

• Your system has been infected with virus and it has disabled the Task Manager
• Your system administrator applied the restriction using Registry Editor or Group Policy Editor.
• Click Start, Run and type Regedit.exe
• Navigate to the following branch:HKEY_CURRENT_USER \ Software \ Microsoft \ Windows \ CurrentVersion \ Policies\ System
• In the right-pane, delete the value named DisableTaskMgr
• Close Regedit.exe

Enable Task Manager by Running a CMD Command

Command Prompt can also be used to directly enable Task Manager. 

Open Notepad.

Copy the code given below and paste it.

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

Save the File as TaskManager.bat.

Run TaskManager.bat as Administrator if you use Windows8, Windows7 or Windows Vista. In Windows XP, simply open the file. A command prompt window will flash for a second and then disappear indicating successful execution. After running the batch file, you will be able to again use Task Manager. If Task Manager is still not available, restart your computer.

There might be2 possible reasons behind this problem:Your system has been infected with virus and it has disabled the Task Manager

Please return new Windows setup.and good antivirus basically Kaspersky antivirus is perfect pc install then scanning your computer. 

Than ok your compute.

fix the issue using regedit.

1. Navigate to HKEY_CURRENT_USER\Software\Microsoft\ Windows\ Current Version\Policies\System. and If you couldn't find the System key, you will need to create it
2. In right area, locate "DisableTaskMgr". If you couldn't find this value, you will need to create a new DWORD value called "DisableTaskMgr". open it.
3. Enter its value data as0 and press OK

fix the issue using gpedit

1. open gpedit.msc.
2. navigate to User Configuration>Administrative Templates>System>Ctrl+Alt+Del Options.
3. In the right area, open "Remove Task Manager" and set the value to Disabled or Not Configured.
4. restart yout computer.