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I am having a problem with this error message as well. I can't open any drawings because of the error message which reads: Aclt has caused an error in AC1ST15.DLL, Aclt will now close.
Go the following web site www.autodesk.com and select the following: choose product (I chose AutoCAD LT)
(bottom left)
(although I did not have any problem with Norton Antivirus 2003 this is the only link that I could find ac1st15.dll to download)
Scroll about half way down and select “ac1st15.dll” when prompted to download select “save this file to disk” make sure that you navigate to C:\Program files\Common files\Autodesk shared. (or if you installed AutoCAD on a different drive then replace C:\ with the appropriate drive letter) If this DLL already exists you will get the following prompt “C:\Program files\Common files\Autodesk shared\ac1st15.dll already exists. Do you want to replace it? Select yes. If the DLL is not there it will be installed. Now try and launch AutoCad.