Error exporting media - Media Encoder will not work. Error at end sequence

Hi,

I've only just started using Adobe Premiere Pro to upload videos on YouTube and I was able to do that without much trouble, until I decided to create a 6-hour instead of  3 hour one. I added a filter effect to my video on top of the audio (that's the only thing setting this one apart from the others I've done). I kept getting an error message after 7 hours of waiting for the sequence to complete. I then went to use adobe media encoder and changed it to software only option, which took me 23 hours to complete. I was told that this would help solve the export problem at the end. But nope, I got a triangle error at the end and the media file could not be read when trying to upload it. It also makes my computer sluggish and I had to pare down the video files to clean up the hard drive enough to keep the original file. Any tips or suggestions on how to fix this problem?