mp4 doesnt load into windows movie maker correctly.

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  I have windows 7 64 bit.i made a few videos with windows movie maker and now when i load an mp4 file it doesnt display in the program correct.It shows a file that has 7 seconds of a black screen and no sound. the movies i already made are also mp4 files. i tried restarting my computer and checking for updates. i ran kasperski virus scan and tried opening different files. i got one to work randomly but it wasnt mp4. my computer is an asus g73 laptop. it has the i7 and ati radeon 5870 with 6 gb of ram. also there is more than 500 gb free on hd. im confused why the program worked fine when i uploaded a video to youtube then tried making another and it wont even load a video to be edited?

  Monday, November 15, 2010 6:23 AM