Task Manager has been disabled by your administrator
When you try to open Task Manager, the following error may occur:
Task Manager has been disabled by your administrator
This error is caused by restrictions placed in Registry. DisableTaskMgr value is set to 1. To enable Task Manager, try any of these methods:
Resolution
Open Registry Editor (Regedit.exe) and navigate to:
HKCU \ Software \ Microsoft \ Windows \ CurrentVersion \ Policies\ System
In the right-pane, double-click DisableTaskMgr and set it's data to 0
Method 4: Using Group Policy Editor - for Windows XP Professional
Click Start, Run, type gpedit.msc and click OK.
Navigate to this path
User Configuration
=> Administrative Templates ==> System ===> Ctrl+Alt+Delete Options ====> Remove Task Manager
Double-click the Remove Task Manager option.
Set the policy to Not Configured.
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