Enabling Task Manager

Error message:

This operation has been cancelled due to restrictions in effect on this computer. Please contact your system administrator.

Causes:

1. Due to some virus effects.
2. Intentionally disabled by the user/admin.

Solutions:

Method 1:

Before anything else, scan your system to see if it is infected by a virus. Use this step by step instruction, Virus Removal.

Method 2: (Not applicable with Windows XP Home Edition)

1. Click Start > Run. Type in "gpedit.msc" (no quotes) and click OK.
2. In the Group Policy settings window,

• Select User Configuration
• Select Administrative Templates
• Select System
• Select Ctrl+Alt+Delete options
• Select Remove Task Manager
• Double-click the Remove Task Manager option
  

Method 3: Registry Edit

1. Click Start > Run. Type in "regedit" (no quotes) and click OK.
2. Search for HKEY_CURRENT_USER -> Software \ Microsoft \ Windows \ CurrentVersion \ Policies \ System.
3. Look for: DisableTaskMgr. Click on REG_DWORD. Value: 1=Enable this key (disables TaskManager); Value: 0=Disable (actually enables TaskManager)
4. Close RegEdit and Reboot your machine.

Method 3:

You can use this Tool, Remove Restriction Tool.