AutoCad 2012 Keygen 32 And 64 Bit! With Instructions

I purchased AutoCAD 2012, and the installer was said to be compatible with 32-bit and/or 64-bit operating system. However, when I initiate the installer, and error message comes up saying that the 32-bit installer will not install on the 64-bit system. How do make the installer run?

AutoCad 2012 Keygen 32 and 64 bit! ~ With instructions ~