With reference to the tek-tips.com site below ...>
Exception in c:\program files\autocad 2002\acdim.arx ARX Command
Unhandled Exception C0000005 (Access Violation Reading 0x0000). at address 7*******h
It states that this problem occurs when creating linear dimensions in paper space in layouts if you use the Center object snap to select the center points of circles in model space. A recommended work around is as follows>>
When the center point AutoSnap" marker is displayed, select the circle, instead of the center point.
Details>
"FATAL ERROR: Unhandled Access Violation ":
http://www.tek-tips.com/vi
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by: CarlWarnerPosted on 2008-05-28 at 06:13:02ID: 21660027
Since AutoCAD is graphics intensive, the first thing I would look at is the video driver version.
I have no idea what your Dell is using for a video driver, but I would look to Dell for the latest release, or, if you have the latest release, install a slightly older version since the most current could be buggy and cause your C5 errors within AutoCAD.