I have zip backup files on a dvd with videos that I can't open now. They were backed up in 2007 and I backed them up using Live One Care. Is there any way I can get them unzipped now?
You could download and install Live One Care again, and use it to unzip those files.
You can also download and install software that lets you unzip files, such as Winzip. Additional details are here: http://social.microsoft.com/Forums/is/onecarebackupandrestore/thread/a8b5f3ae-ad8f-4b4a-ad48-02bb7b151782