I remembered that there is no perfect or automatic solutions for that.
Try this and check if it does the trick:
1. Copy the PowerDVD19 folder at the following path to other folders that will not be touched by Windows restore:
C:\Users\your name\AppData\Local\CyberLink\PowerDVD19
2. Reinstall powerdvd after Windows restore.
3. Replace the new created folder with the old folder that you backed up previously.
You can test the steps in advance before you actually reinstall Windows.
I recovered my personal settings once using this alternative way, but it is not a formal method and might cause more bugs.
If your powerdvd got screwed, you have to reinstall it and restart everything from scratch.