Have an error code : 0x8007000D

Today when i opened my pc i realized that when i clicked once on something (folder , app , image) it opens while normally it need double click in order to open a folder or run an app.Also if i move my cursor on something it clicks once by itself.Then i had a blue screen and when it restarted just before it goes to desktop there was a black screen with a window message :" Windows is not genuine. Your computer might be running a counterfeit copy of windows" With two options : -> Get genuine now. ->Ask me later and at the left bottom on the window there is the code 0x8007000D.

Then i realized that the pc is really slow so i installed a antivirus and scanned the pc (after 1 blue screen exactly like the first one). Found a trojan which was both in my "Download" folder and in the "syst32"(the same one i guess).So after the scan i cleaned everything and i did a restart. But the window with the message and the error still exists and the problem with the one click opening.

So i searched about the error message and I found this

I followed the steps of the 2nd method. The scanhealth was successful but at the restorehealth's result was "Error : 87 , The restorehealth option is not recognized in this context. For more information refer to the help. The DISM log file can be found at C:\Windows\Logs\DISM\dism.log"

I have no idea what's going on , never happened before and i am out of ideas.

PS: My windows had a key and somehow disappeared.