I really have followed link of downloading Autocadhttp://www.autodesk.com/products/autodesk-autocad/overview
and while I installing Autocad on my other laptop which is Acer, and clicked on 'Download now', then the Autodesk download manager ' downloaded, after that, it downloaded the 3.65Gb, Finally, when it completed after about 17 hours, I clicked on 'install' button as it shown in this screen shot below, but I faced the error:
The translation of that error is as follows " (the entering point wasn't found), it was unable to locate the place of entering point for the procedure "wmemcpy" in the Dynamic linking Library")
Note: because the base lanague of my Windows 7 is Arabic, even when convert the user interface into English, hoping the error message shows in English, but it is still shown in Arabic, but I think that I have translated above as much as I could.http://imageshack.com/a/img208/9894/nsgn.png
So I don't think that the problem is associated with any errors in downloading or instnalling the program, however, the program may require some hardware requirments such as RAM size or VGA or any others.
RAM is about 2.5GB and H.D.D is 120GB, VGA is x3100
I really don't know what the error is.
Note, the error was showing to me with the other laptop(HP) while installing AskutoDesk not downloaded from your link is different than what is showing me with Acer.
With Acer is:http://imageshack.com/a/img208/9894/nsgn.png
With HP is:http://imageshack.com/a/img546/3320/aaq4.png
HP has much better specs than Acer.
Also, I have tried installing the same program on a Dell laptop with Specs much better than Acer's as well, and the program is installed well.