I honestly don't know if anything else would have worked if I hadn't used my Vista install disc. According to a friend of mine, the file was probably "broken" in some fashion, creating an endless loop of trying to read it by my system...that's why I couldn't delete it as it was always shown "in use". I don't think it was a virus or malware, but it was likely put on the network by some little turd looking to cause havok. The scary thing is it won't show up as anything to worry about when you scan it before opening it. I don't know how to prevent this from happening again, other than to completely avoid video files from LW.