Task Manager has been disabled by your administrator message
If your own pc suddenly displays this message when you’re trying to do something, chances are most probably some kind of malware has infected your pc. To remove this message, download this file and double-click it. It should now remove this problem forever. I got the file from some website while Googling thru the internet to fix this problem. If this file belongs to you, please contact me by commenting on this post so I can give you the proper credit.
p/s: However if this problem surfaces again, most probably because the malware is not yet removed from your system. Try running any updated anti-virus or anti-malware on your pc to clean the malware. By the way the file above is a free software called Remove Restriction Tool v 1.0.
Disclaimer: I take no responsibility for what the file may cause to your pc. The file works perfectly on my pc and most (if not all) other pc, so there’s a big chance it will work perfectly on your pc too.