Adobe Premiere Pro 5 Media Encoder crashing

I have generally had no problem creating MP4 files using the Export Media option. I am currently working on a film that is 1 hour 45 minutes long. When I went to export as an MP4 it works for a bit and then crashes, I get Encoder Failed with no more detail. It does produce a partial MP4 up to the point that it stops.

I have a Dell XPS 420 64 bit with 8 GB of RAM. This project is using a JVC Codec which is the first time I have done that. I have exported previous versions of this film before without trouble so I am really scratching my head on this one.

I have checked the usual things for example there are no gaps in the timeline etc and I have plenty of space on the hard drive.

Any ideas or suggestions would be greatly appreciated. Thanks