. . . . i'm woundering what program have succeded the dvd7. . . .
The nearest would be Photostory which is more advanced the Movies on DVD 7 was. Movie Studio is even futher advanced.
What is your computer specification and Windows version, see this topic for what is required and please quote processor and graphics card make/model in full, and also what monitor/screen resolution(s) your are working with if this is a laptop.
You can download and test for 30 days trial versions of these programs before purchasing - do note the trials do have limitations in the number of video formats supported, features and effects, and export is limited to 3 mins run time.