I have downloaded the trial version of AutoCAD LT 2015. Everything went as expected until the Setup.exe file was supposed to begin the installation. The file simply will not run on my computer. I have a Windows 7 Pro 64 bit machine. I rebooted using msconfig to run the file in a clean environment - didn't make any difference. The Setup.exe file I am trying to run is for a 64 bit environment so I'm sure I have the right file. I'm completely at a loss as to what this could possibly be.
Other info: I've been an AutoCAD user for 16 years and am somewhat skilled with computers. This machine has never had AutoCAD installed on it.