Hi all. I am brand new to this so please bear with me. I was just given an old Dell Dimension 4600 with a CD burner and integrated sound card. I needed a new PC so that I can edit home videos on my computer (my last was a Windows 98 - inadequate). I purchased a Lite-on DVD burner and installed it. Video is fine. However I keep getting a clicking sound as the video runs and the audio is slightly distorted. Do I need to purchase a better sound card? or a new video card? The sound from the CD player or from the internet is fine. It is DVDs that produce the clicking - homemade or commercial movies. Please help.