Can you give us some more information about your player?
Go into your player's menu and select [Setup] then "Firmware Info" or something similar and post that information here.
Where did you buy it from and can you post the URL?
Generally the "invalid format" tells me that you may need to convert your videos to a specific screen size resolution, such as 320 by 240.
There is a very good video converter called "viDrop" which is at the top of the "Video Related" section of the forum which you can use but the settings will depend on your player and it's screen size.
Look forward to hearing from you.
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