Answer for:

Why would video files suddenly become zero-byte?

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OH Smeg

Look at using the system in Safe Mode and using your Installed AV Product as well as Malware Bytes to check for infections and hopefully cleanup any that are found.

If that doesn't find anything try the Ultimate Boot CD and test the Hardware. Pay particular attention to the RAM and HDD tests.

Also look at the Power Supply of the system if it is a No Name Brand consider replacing it with something like the unit shown here