Autocad 2008 Windows 7 64 Bit 58 |link| Access
This is the most common fix for the "Cannot install on 64-bit Windows" error. It involves manually removing the 32-bit OS check from the installation files using a free tool.
Once you've installed AutoCAD 2008, you'll need to apply the patch to fix the "Error 58" issue. Here's how: autocad 2008 windows 7 64 bit 58