It worked for a couple of months, but then whenever I'd try to start AutoCAD 2007 in its "3D Modeling" workspace, AutoCAD crashed. I finally figured the problem was might be due to a corrupted template file -- acad3D.dwt, specifically, which sets up AutoCAD for its 3D-like drawing environment. (The crash occurs only with the 3D template files.)
In an attempt to cure the problem, I looked for the original acad3D.dwt on the distribution CDs. Find it was not easy, but I eventually found the .dwt file on CD Disc2 in the following folder:
I copied the file over onto my computer's hard drive -- but to where? Autodesk inconviently "hides" most support files in numerous hidden folders. Template files are stored here:
C:\Documents and Settings\[user login name]\Local Settings\Application Data\Autodesk\AutoCAD 2007\R17.0\enu\Template
(Replace [user login name] with your login name, such as Adminstrator.)
After all that, it didn't work. AutoCAD still crashes when starting up with the acad3D.dwt or acadiso3D.dwt templates. But know you know where the files are kept.