how to reinstall my original windows

[Narutoo]

Hello, I gave my laptop to a shop because of some problems. Its windows was official 8 and the person installed windows 8.1 . Now it is saying activate windows because the product key is used by many pc.
So can I reinstall my original windows 8 somehow?

 

[Paul NZ]

Take it back tell them to fix it

 

[Josmar]

You should keep your windows product key at the back of your laptop (sticker) before you give to repair shop, they can steal it from you. follow what Paul NZ said.

 

[ToineF]

if you still have the product key than you should be fine.

if it fails to simple activate, try to do the phone activation. it will probably work.