There is a codec problem for Windows 7 Home and Starter Users. From what I saw you would have to upgrade your windows to get more Mpeg2 codecs but there is a work around for any dreams that use MPEG video formats. Just rebuild them with the dream maker tool after converting them from MPEG to WMV using a Freeware program called FreeStudio. First you need to know where it stores the video files that are to be used as your
dream scene. They are stored in C:/ProgramData/Stardock/DeskScapes/ExtractedData/ Folder. This is where you will be looking for files to convert to wmv format.
Once you have DVD Videosoft's Free Studio Installed:
Click the green button for DVD & VIDEO
Now click Free AVI Video Converter!
Convert using High Quality Setting. Screen Resolution is a key factor.
From here your video is converted and you can open up Dream maker and repack the file using the original details such as the person who created it etc and giving it the same name or relabeling like Data Scan WMV.
I have tested using this method on a couple that gave me the MPEG2 codec error saying the video was corrupt or no compatable MPEG-2 Decoder was present and managed to get every one I tried to work just fine in Windows 7 Home.