The answer to this is probably nobody; additionally, if someone did, they probably can't sue you. As Todd Gardiner mentions, if the company no longer exists it's very likely the commercial is an orphan work. read more
Most people think of commercials as a free bit of advertising that they are subjected to when they watch television or listen to the radio. Just because a commercial is broadcast for free through certain media does not mean that it is legal for anybody to upload the commercial on YouTube or post it for download on a website. read more