(Windows 10 Ultimate 64 bit)

After time editing videos the clips I have seem to just magically corrupt for no reason. I don't think I have done anything to make this happen but I just get to a point and they all just blank with the yellow '!' triangle and say: Do you want to remove [Name] From the project? This might not be recognised as a format (it is) The movie cant be published until [name] is removed. 

Error 0x87260103

I find this very annoying as I then have to start again and I depend on this software for making videos.

Any help appreciated.