I did a Google search on that error string, and searched the support.magix.net user's forum and didn't get any hits. Can you provide more details?
I'm guessing by stage 3 of 4, you are referring to burning a DVD. You also referred to powerpoint presentation pictures, but I don't see anything attached (may it's just me).
The first question is if this is a MEP error or Windows error.
I can offer one tip, however. Burning problems with MEP can frequently be solved by installing the latest burn routine, available at support.magix.net.
You have to sign on with an account to get there, I believe.
Sometimes other programs (Nero, for example) will over-write some DVD drivers causing MEP to have issues. These burn routines have always set things aright for me.