@Yuni

Not a lot to go on there - we need more information:

1. Computer specification - processor make/model, graphics card or chipset make/model, audio card or chipset make/model, RAM,  hard drive configuration, sizes and free space?
    
2. Windows version and is it up to date?  Press and hold down the Windows key and the R key - in the dialog that opens type in winver and press enter.
    
3. Have you restarted the computer ie Windows key, Power option, Restart - not shutdown.
    
4. Is this the newest version of Music Maker

Also please read this post before replying and add any other information you think may be relevant.

John EB