I have a DELL Dimension 2400 w/Windows XP (desktop) and I've had it almost 5 years. I recently made a movie of my daughters wedding pictures (adding music) using PhotoStory 3. I'd had an external HP 840y DVD writer installed on it for about 3yrs and it's been a couple of years since I'd used it. Tried burning this new movie and couldn't get the burner to work. After several days, I gave in and bought a new HP DVD 556s burner..and can't get it to install, because there's not enough space on my computer. I've unstalled everything I know to uninstall, deleted tons of pictures...and I still only have 10.2GB remaining. The requirements for this new burner are minimm hard disk space 1GB free for included software installation, 10GB free for DVD video disc creation.