Activation failed

[Clare999]

Hi, I've been using Adobe Acrobat on this pc for approx 3 years without any problems. All of a sudden today when I try and open any pdf I get a message saying the Activation Failed!!! I have no idea why. Error message suggests that I need a working internet connection to activate product. I have a working internet connection - I'm using it now to post this. I've rebooted a couple of times - not helped.

I'm pretty sure that the software was preinstalled on my pc when I bought it. I can't find a number to call to speak to someone in Adobe about it so I'm hoping someone here can help. I'm using Windows 10. Please help......Thank you

[Test Screen Name]

You need to find out what product this is, whether it is subscription or permanent license, and if it is permanent license you need to know the serial number. Without this you are likely to permenently lose it.

Then... the problem may well be your firewall.

[Clare999 · Accepted solution]

Thanks for the reply. I have just noticed that on my desktop I have Adobe Acrobat DC (subscription - I think I signed up for a trial some time ago), as well as Acrobat Reader DC (preinstalled). Somehow while I was sleeping last night my pc decided to change the settings to use Acrobat DC as the default program for pdf files! I have absolutely no idea how this can happen as the last thing I did last night was to read a large pdf file so it was clearly using Reader DC then. No one else has access to my pc but clear as anything there in the default settings - it had been changed!! Thank you for the reply - I've changed the default back now to Acrobat Reader and will uninstall Acrobat DC.