It was not this printer and all I can share is my workaround. I used Adobe Distiller back then but today would use DoPDF (see google) to print that 6th doc to a PDF then print the PDF.
It's pretty clear the PC is somehow a factor but the make, model and all the details are not here so I'll share my workaround and move on.
Bob
Hi
New Samsung ML-1865 mono laser printer; out of the box, installed the DVD and worked fine - for about 6 documents then seized - Printer Status said loading 99%.
Uninstalled and reinstalled DVD and again worked fine - for about 6 documents then seized - Printer Status said loading 96%.
Phoned Samsung, downloaded latest driver, worked for 2 documents then seized - Printer Status said loading 94%.
Took back to dealer who printed no problem. Bought new USB lead, no different
Having lost sound and dvd writing capability on laptop - Windows XP Media Center, AMD Sempron 3000+, 1024 MB RAM, Word 97 - yesterday did a complete system restore but now Printer Status is down to saying loading 92%.
Have I picked up some sort of virus? Or is there something I can do, please?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic