After update to Win 8.1 the program issues error message -6 and shuts down. Same thing if started as administrator. Same thing if starting in Compatability Mode. A repair run issues error code 1603. It was ok under Win 8.0.
Windows 8.1 upgrade breaks some software - and this is not restricted just to Magix software.
MEP 17 is not Windows 8.1 compatible. If you can get it to run, which looking at that error message is looking unlikely, you will almost certainly have issues with DVD drive not being recognised.
Time to upgrade to a Windows 8 compatible version.