Cannot open or start AVI movie file

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1

2.69. this same file worked a few days ago.
i click on Render>Render Animation.

any ideas?
thanks

2

Please could you explain more in detail. What do you want to animate?

3

Thanks Mahol.
I know how to animate, it was working a few days ago.
it is a blender error

4

i believe it is a corrupted file in windows 7

will use an old backup file of this one.