Install Autocad 2011 with windows 7 and 64 bits

[Anonymous]

Hi! mi problem is that a cant install autocad 2011 with windows home premium 64 bits, i downloaded the trial version for 64 bits and i dont know why i cant install it...please does anyone know why? my sistem properties are:

intel core i5 cpu

ram 4 gb

64 bits

and when i try to install it it appears this: operating system not compatible

[hashim.mundol]

Please check the system requirements here

http://usa.autodesk.com/adsk/servlet/pc/index?siteID=123112&id=13784795

Incompatible error is usually when you try 64 bit software on 32 OS or v.v.