2 things I can see right away. The error you describe looks like a buggy installer code. Which ISO did you burn and which version.
Another thing. You mentioned your system has 6GB of RAM. I've never owned anything similar to that beast, and I'm not even sure the VL kernel supports all of that or not. But if your system boots up to see the install process, then I guess you should be fine, leaving the focus of this post on the first question... Which version did you burn and which ISO, which release?
Also, dont forget to verify MD5sum