[Question] I have to fix my boss' computer

So. As the title says, I have my boss' laptop. This is a toshiba originally packaged with windows 8 home. He needed to join our office's domain and asked someone to install windows enterprise and that someone did install a pirated version that now no longer works. Windows key is missing, original disk are also missing and recovery partition is deleted. Is there a way to recover his installation or I will need to install another pirated copy?
 
Well, originally, all I had to do was update the laptop to 8.1. But after installing all the previous updates, the 8.1 update no longer appeared in the store and the windows is not activated message showed up. After that I realized that this was a pirated copy.
 
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