I have Windows Movie Maker 2012 on a Windows 8 computer. I uploaded several .wmv files to the program and they played fine in the preview screen. After organizing the files and saving the project I then tried to upload additional .wmv video files to the project. These files showed up with an error code saying the files were corrupted and had to be deleted. So I deleted these files, but then when I went back to play the first files that were saved and had played previously it also told me those were corrupt and had to be deleted. Now whenever I upload a .wmv file it will start to play in the preview window and then stop and give me the message that it is a corrupt file that needs to be deleted. Please help me fix this problem. Thanks.