FFXI-2003: Failed to Read Data

Platform: Windows 7
ISP: CenturyLink
Type of Internet Connection: DSL
Internet Connection Speed: 8mbps
Date & Time: 12/14/2011 9:00P
Frequency: Always
Character Name: Freebytes
Race: Elvaan
World: Leviathan
Main Job: Black Mage
Support Job: Red Mage
Area and Coordinates: The Sanctuary of Zi'Tah and Gustav Tunnel
Party or Solo: Solo
NPC Name: None
Monster Name: None
Steps:
1. Zone into the area.
2. Receive error FFXI-2003 and the game kicks me out.
3. Used a different hard drive that has the game on it and update to the latest version.
4. Problem still happens exactly the same.

This is the same hardware, but the hard drives were different installs. The issue happens consistently. I use a mule, and it works fine. I used a different computer to move myself back to my home nation, and it worked fine. Valkurm Dunes, North San d'Oria, Port San d'Oria, Mog House all work fine. Tried adjusting resolution, and the issue still happens.

Gigabyte GA-H67A-UD3H-B3 motherboard with the latest firmware. Intel i7 quad core processor. GeForce GTX 500 series video card. I believe this might be related to some video rendering problem. I tried this with a Plextor solid state hard drive (SATA3 6Gb/s) and a standard hard drive. The issue began immediately after the updates, and I have had no issues before then.

I used a process viewer to monitor which files were being accessed, and I was missing folders under ROM2 so I checked another computer that was working and found that I was missing about 4 folders! I copied these folders from that machine to this one, and it began working. The only thing in common with the machine after swapping hard drives (full operating system on each) is that they were both running Avast anti-virus. This may have been the cause or it could have been some strange Windows 7 file permissions. Anyway, it is partially working now... except I might need to do another full install and update without the anti-virus running to make sure I really get all of the updates.

Greetings, Freebytes!
Thank you for posting your concerns about being removed from the game. I have made sure to submit all of your information to the development team, and they will thoroughly investigate this matter, based on your report. Unfortunately, I cannot guarantee that a direct response will be posted on this thread, but I do recommend checking here and here for any details regarding the development team's investigation. I also suggest contacting the the SQUARE ENIX Support Center, just in case they may be able to find the source of your troubles if you continue to run into the same problems. Thanks again for your report!