@MACIEJ-SZAMBELAN

Welcome to the Magix user to user forums.

Unfortunately, without a lot more detail from you we are extremely unlikely to be able to help, sorry.

First, please read this post and give us all the details requested there about your computer and operating system.

Then, please tell us exactly which version and Edition of Music Maker you have.

When you try to open the program what. exactly, happens? Do you see an error message? if so, please tell us the words of that message in full.

With that level of information from you we may be able to suggest a solution to you.

Jeff
Forum Moderator