• Insufficient Memory Or Disk Space

It sounds like a ScaleList thingy again. The problem is that you can't open the drawing to clean it. Try using the CleanupScales utility fron AutoDesk Hopefully it can do it without having to open ACad entirely. Also, try to set your Windows swap file to something larger (fooling ACad into believing that there's more RAM). If however you're already at max RAM (i.e. 2GB) and running in XP you could set the RAM extend to 3GB. Can't remember exactly how, maybe do a google on this?

While using AutoCAD, the following error occurs or AutoCAD crashes: AutoCAD is running out of system memory. Continuing the current command may result in program. AutoCAD Inventor:: Out Of Memory Error Even Though 11GB Available? Not Enough Memory To Perform.Error. Error / Insufficient Memory For Load Oct 19, 2011.

Insufficient Memory Or Disk Space

Appart from that, try opening the DWG in a Vanilla 2008/9. May work as it doesn't load all the extras from MEP.