Incidentally, I did dig up an older thread on RC on this topic, where one fellow (Tom) writes:

As an aside, I have had LOTS of those errors when downloading. I've used an older 233mHz laptop which has been dandy for prontos, Sonance K2s, RTIs, Xantechs, and so on...but suddenly with the 700 and 850 in my arsenal, all these errors.

I endured for quite a long time and pulled the battery several times on some projects. Was even considering building a little gizmo to fit between two batteries with a little momentary push switch so I could do a quick reset.

I found some memory on ebay and upped the ram from 64m (typical for this age laptop) to 128m and problem has gone away.

However, the laptop I'm using is a 1.6Ghz system with 1GB of RAM on Windows XP SP2 ... so I doubt it's a resource issue. Someone earlier had suggested that it could be an MXF file corruption issue??