Render to the standard DV template(Type: Video for Windows – avi files). You will have to create the subtitles as text events on the track above the edited video. These cannot be turned on and off as on the DVD.
The different numbered versions of Vegas install as an independant application, not over your existing version. Try installing the trail version if you like.
If you are finding that the nabigation is getting more difficult, set up markers that you can easily popto using the numbers (not the umber pad)on the keyboard.