Basically my Movie Maker has all of a sudden started saying my videos are corrupt, I often record sessions on Counter-Strike etc and shorten them in Movie Maker, but ever since I upgraded to Windows 10 I have had this problem where it keeps saying my files are corrupt.

I have tried lots of things to fix this, I have tried troubleshooting, compatibility mode, re-installing, using other file types and also saving as a project before editing and none of them worked.

If anyone could help me fix this or let me know of a similar free software where I can simply cut my videos down and save in HD I would be VERY grateful, thanks Jamie