Here's how to fix task manager and regedit disabled by virus.
1. Download malwarebyts
2. Restart your computer
3. F8 to go to savemode
4. Scan using malwarebytes
5. After scan complete, quarantine and save to textfile virus location from your registry.
6. Open your regedit
7. Locate Taskmanager and regedit
8. Delete Taskmanager and regedit entry
9. Restart computer to normal mode
Done!