I'm a first-time user and I'm having problems rendering my video using Sony Vegas Movie Studio 8.0.

It's about 3 and half minutes long, but it has lots of effects. When I try to render it, it goes to somewhere between 60 and 80%, then stops. The "Time Remaining" clock goes down to zero and the "Time Elapsed" keeps going. It's gone on for 7 hours at one point. There's no error message or anything, it just stops.

The frames that are shown in the preview menu stop too. I have to cancel the rendering, which freezes the program, and i have to ctrl+alt+del it. I can do smaller files, just not larger ones.

I've tried defragging my hard drive, but that didn't do anything to help either.

I'm also having a problem, during playback, where suddenly, the preview screen will turn bright red and stop the video. The audio will keep playing, but when I press Pause, the entire program freezes up.

Is there anything I can do to fix these problems?