Hello, sorry but I don't think we can help with that ): One of my friends also had the same issue on Windows 7 so I think it is some problem between the newest version of UE4 and Win7, that really is beyond my comprehension sadly, as this is our first game ever. I searched on google and tried different things but no good results came from this. It just appears to be an engine bug that hopefully will be resolved in the next update of UE4.