One of our computers crashed and we had to replace the hard drive. Now we can't get Photoshop to open. Since the computer didn't give us any warning we didn't get to deactivate Photoshop before the crash. I've been on the Adobe site for over an hour getting run around in circles without getting even close to finding a solution. Apparently, there are no living humans at Adobe and their customer care department consists of this "community" and a lot of redundant web pages. Decent customer service would be a nice touch for such a big company.
So sorry for your troubles. This is a user-to-user forum & we're all just product users like you. Unfortunately, we can't help you with deactivation/activation issues since we don't work for Adobe.
In the US, Customer support phone number: 1 (800) 833-6687
On-line chat is usually the best way to reach customer care. But their hours vary by region.