Hi NancySue,
Welcome to the Sony Community!
What do you mean by putting the videos together to make a movie? Are you combining the videos? Or creating a disc? What was the error message you're getting?
You can find step by step guides on the different functions of PlayMemories Home at support.d-imaging.sony.co.jp/www/disoft/int/playmemories-home/.
If my post answers your question, please mark it as "Accept as Solution". Thanks_Mitch