After opening a dwg AutoCAD will completely shutdown for no apparent reason. I will get an error such as "FATAL ERROR:  Unhandled Access Violation Writing 0x7e5116e8 Exception at 1262072h". I have tried to un-install and reinstall AutoCAD (also deleted the Autodesk registry subkeys), but I still get the same error. I contacted AutoDesk tech support but they said they no longer support 2006. I have also contacted our network administrator to see if this could be related to any Microsoft updates, but have not got a response back yet. I don't use AutoCAD everyday so I am not exactly sure when the errors would have started. Any help on this would be greatly appreciated. I hate to just trash this software and purchase 2011 if there is a fix. Thanks for any help with this.

I first noticed this last week, but since I don't use AutoCAD everyday I am not sure of an exact date. It appears to happen with all drawings, some are locally on the computer and some are on a file server. It did allow me to create and save a new drawing, but when I reopened that drawing it shutdown with the Fatal Error again. My OS is XP Pro SP-3.

I do have SP-1 for AutoCAD 2006 LT installed. I have not installed any new software latley, but our network administrator did update our antivirus software (McAfee) the other week. I will try doing the complete un-install and reinstall. Thanks for the tips