(1) I'm hoping auggy is onto something with elbycdio.sys. Have you done a full search in File Explorer & in RegEdit for "elbycdio".
What was discovered? What folder holds the elbycdio stuff? Can you tell what app created the folder? That app is a good candidate for uninstall.
(2) I found this at your site...
https://www.msi.com/faq/nb-2102.html
When I place a CD/DVD disc or switch another disc on my optical drive, the system doesn't load the disc automatically and still shows the content from the previous disc, what should I do?
Unfortunately, you've already done the cure - update the BIOS. But - if the update was done after you last fiddled with drivers - maybe go into Device Manager & have it uninstall & then reinstall
the DVD driver. I do know you've got the right driver.
(3) If the DVD media won't be read in either DVD drive - can the media be defective? Have you tried inserting a blank DVD? It should ask what to do with it. What about the Win 7 Installation DVD? You can boot to it. What happens when you insert it after boot to 1803?
OK - I see that other answer now.