What's your precise beef with your RAM Previews? What kind of footage are you using? What are the comp's dimensions? What other kinds of layers are in the comp? What kinds of effects are you using?
Without that kind of information, we can only take shots in the dark, and here's mine: gather a group of good Christian friends and beseech them to pray over the machine, asking The Lord's guidance in solving your problem.
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA