found this..may be of use.
System Requirements
System requirements for AutoCAD 2007 for users who are focusing on 2D drawing creation are as follows:
Intel� Pentium� IV processor recommended
Microsoft� Windows� XP Professional or Home Edition (SP1 or SP2), Windows XP Tablet PC Edition (SP2), or Windows 2000 (SP3 or SP4)
512 MB RAM
750 MB free disk space for installation
1024x768 VGA display with true color
Microsoft� Internet Explorer 6.0 (SP1 or higher)
System requirements for AutoCAD 2007 for users who are taking advantage of the new conceptual design capabilities are as follows:
Intel� processor 3.0 GHz or greater
Windows XP Professional (SP2)
2 GB RAM or greater
2 GB of disk space available, not including installation
1280x1024 32-bit color video display adapter (true color)
128 MB or greater, OpenGL�-capable workstation class graphics card