It's difficult to make recommendations as it depends on what you are trying to do. Generally, the more versatile the app the more difficult to use. There are a number of reviews if you google "best dvd authoring software", no quotes. One of them
I looked at had quite a good comparison of capabilities. Take a look at screenshots where available.
If you are looking for freeware google the above but with "free" in there. Here's one
In forums you will find that DVD Flick is quite popular. If you are considering the Windows DVD maker, read the last para in the above link regarding your version of Win7.