i've been using Vegas movie studio for a while now, and for months now it's not letting me render more than 20 seconds. i make 4 minute vids regularly and i have to cut them down to 20 seconds or less and save them under diff names to render them, and sometimes that doesn't even work. it always "errors" and the errors are always different. i have tried uninstalling it and re-installing it more than once. i'm wondering if i'm low on virtual memory, but i can't figure out if i am, i haven't had any elerts to it? please, someone help, !