Some video appears currupted in windows 7 and cant be played!!.

Hello, I was watching videos on my laptop normally but suddenly most videos appeared corrupted and won't open, I cant play them any more. I've formatted my computer but sadly they are still corrupted please help me what the hell happened to those files????I've
tried an anti-malware software but it didn't found anything...

So when you play them after exporting in QT and do get info what are the codecs and bitrates?
If you want to have life easier use MPEG Streamclip, open, select export to MPEG-4 and pick a preset from the iTunes button and you will be happy. And it also does batches and you may find it is also faster.
And it is free.

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