I had the exactly the same printer and same problem on one of my PCs. The printer is working fine for all other PCs (Windows 7 and MAC iOS) except this one which is running windows 8 64-bit .
INTERNAL ERROR - Including Corrupted Data
POSITION: 0x30d4 (12500)
VERSION: SPL 5.35 06-03-2009
It will be greatly appreciated if some one can help to fix it.
I finally figured out what was wrong. I had changed to AVG Internet Security and when googling this issue one reference was to do with AVG. So for me all I have to do is disable the AVG Security while I want to print then turn it back on. I am going to call them tomorrow to see if they have a fix so I don't have to bother with turning it off. I may just go back to Norton as I didn't have that issue but I just bought this and put in on a couple weeks ago so will probably just turn off for this year.