Christopherri, I am confused - you mention '2004 X64 reader' - what is this?

Not many object enablers are 64 bit - I believe this is the problem you are faced with. I saw the same problem yesterday when a person asked me why navisworks could see prosteel members on a 32bit xp machine, but not on an inventor 2009 vista 64bit machine. My answer was - it's 64bit! the object enablers dont work on 64bit!

If this is the case, then you would need to install a 32bit version of autocad - I am the formost authority on the subject, if you would like a link then ask.