i have a power mac g-5 quad with an external dvd drive and a external hard drive and 2gb of ram. on my ext. hard drive i downloaded mac the ripper and that is where i put all my dvds, now today on my pmac i was using mac the ripper, popcorn, itunes, safari all at once and it froze up on me?why? could the ram be an issue? how may programs can i use at once with my pmac?