My AutoCad LT 2000 will not start anymore. The error message says there is a missing .dll file ( AC1ST15.dll). This version of AutoCad was already installed on this computer before I inherited it and the guy before me took all the disks with him when he quit here (about 2 years ago).

I did a search on my hard drive for the the file and there were 3 copies of that file on the drive but evidently AutoCad can't find it. The three files are located at :

C:\PROGRAM FILES
C:\PROGRAM FILES\COMMON FILES\AUTODESK SHARED
C:\Mcam8\COMMON\ACADData

Where is AutoCad looking for this file? And can I just copy the .dll to the proper folder or does it have to be "installed"?