Simple, uninstall the affected software. During uninstallation you won be asked if you'd wish to keep registration issue. Select 'no'. All done
That said, you can keep it installed on multiple PC's (2 in your case?) As long as they don't both have the software actively running (mainly for anydvd, both PC's do NOT have the fox tray icon active at the same time) you'll be fine.
It's mainly to stop users from installing and registering the software on dozens of PC's with the same key.
Installing and registering on 2 PC's isn't really a big problem. Just don't have them both running the same software at the same time with the same key.
Or to be really safe, you can always pick up an extra license, the funds will definitely be appreciated
Sent from my Pixel 3 XL using Tapatalk