If you've just realized that your task manager has been disabled, you can re-enable it yourself easily.
Step 1: Run the registry editor Click on the Start menu, and then click Run. When the window comes up, type Regedit.exe and press Enter.
Step 2: Navigate to the system folder Open HKEYCURRENTUSER. Then go to Software, then Microsoft, Windows, CurrentVersion, Policies, and then the System folder.
Step 3: Delete DisableTskMgr Move the cursor to the right panel and click DisableTaskManager. Delete this item by pressing the Delete key.
TIP: You can also right-click DisableTskMgr, click Modify, and then change the value data number to zero to enable it.
Step 4: Test the task manager Test the task manager by right-clicking the task bar at the bottom of the screen, and then click Task Manager. Or press Control-Alt-Delete. If the Task Manager comes up, you have successfully enabled Task Manager.
Step 5: Check virus software Check your virus software or contact your computer manufacturer's technical support. Sometimes a virus on your computer can disable the task manager.
FACT: In 1980, Microsoft partnered with IBM to create an operating system for IBM's first personal computer called MS-DOS.