somebody please help
Welcome to the forum, and to the wonderful world of Adobe.
Now, you indicate that you have tried AV files of different types. Can you be more specific, and offer complete details on the files that you have Imported? This ARTICLE will give you some background on AV file formats, and how to get the details.
Next, please tell us about your computer, especially the video card, and the current driver. Have you very recently updated your video driver?
This ARTICLE might be helpful, especially the articles that the replies link to.
Also, please be patient when posting questions to this forum.
The people who answer your questions do not work for Adobe and are not paid for doing this. We do it simply because we care and want to help out fellow videomakers.
But we can't be on here 24/7! So please be patient when you post a question. Someone will usually respond eventually.
So true. I'm in the middle of my taxes, so I have missed about 8 - 10 hours of forum time this week...