I this case, after i do some troubleshooting, task manager is disable by virus, malware trojan or pieces or spyware, but dont panic, user still can repair it If this happens you normally need to edit the Windows registry to fix the problem. User account are restrict to not allow them to run Task Manager, you need to have the administrator account to do this.To open the Task Manager, you normally would do one of the following:
1)Press CTRL-ALT-DEL on the computer keyboard
2)Press CTRL-SHIFT-ESC on the keyboard
3)Right-click on a blank area on the start bar and choose Task Manager or
4)Click on Start Menu, Run and type TASKMGR in the run box and press Enter
6) after open task manager if user can open it,
User can hack registry by manual, if user still cannot open task manager are disable by administrator you still can access to registry by open regedit in start menu program windows xp follow step by step with screenshot how to enter task manager disable by administrator.
Open up regedit.exe through the start menu search or run box,
and then navigate down to the following key below:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System
On the right-hand side is a 32-bit REG_DWORD value named DisableTaskMgr with one of two values:
* 1 – Disable task manager
* 0 – Enable task manager