Transoding an AVI to DVD using Nero Express

All of a sudden while trying to make a DVD using Nero VIsion Express 2, the PC is getting stuck. Even if I try to abort the process nothing happens. I have to quit the task using the Task Manager. I also noticed that the process takes also 99% of CPU.
This blocks the PC from any other activity. I used to create dvd’s while doing other tasks but now everything is getting stuck and the video file never gewts transcoded. Any Suggestions pls. :bow: