Windows 8.1 as supplied by Microsoft does not have built in support to play DVDs.
It sounds like your AutoPlay settings are set up to open DVDs with an app that's no longer installed, or is broken.
If your HP Probook is running the Windows originally supplied and installed by HP, then HP may have include a 3rd-party DVD player called PowerDVD. See if you can find it and open it, if so it should be able to play your DVDs and you should be able to choose it in the AutoPlay settings as the default app.
How to Turn AutoPlay On or Off in Windows 8 and 8.1 AutoPlay lets you choose an action for different kinds of media when you plug in a device, insert media, or receive content from another person using Tap and Send. You can set AutoPlay to open different kinds of content, such as photos...
If not, the you can install another Media Player that can play DVDs. VLC is a popular choice, and it's free. Once installed it should make itself the default app for playing DVDs.