Deactivate Acrobat XI pro

You can't deactivate it if the computer is dead.

If you ran out of activations you need to contact Adobe Customer Service again and ask them for an "activation count reset". It's best you don't mention it's for Acrobat XI at all, as they will probably say it's not supported, which is true but not relevant to this issue. They have to perform this reset so you could use the application. No one else can help you with this.

You may have to call customer service for both deactivation and reactivation.