I put the two files that are erroring in "C:\My Documents\My Folder\" folder and allowed the automatic scan to run. No errors resulted; no crashing resulted.
Because the error/crash has been intermittent, I would want to see it work at least two or three times more before I'd conclude that moving the files higher in the directory is avoiding the crash. But, as I noted in my original post, the error is related to large .rar files in a fifth level folder. So I won't be surprised if this move would avoid crashes.
This, however, in no way negates the problem that 2009 Internet Security is causing. I should not have to move files all over my PC just to allow VS to work. I didn't have to do it with the previous version, and I should not have to do it with the new version.