System Requirements
Windows® XP Home, Professional and TabletPC (SP1 or SP2), Windows XP Professional x64 Edition,Windows Vista® 32 bit (Business, Premium and Ultimate), Windows Vista 64 bit (Business, Premium and Ultimate)
Microsoft® Internet Explorer® 6.0 SP1 or later
Intel® Pentium® 4 1.4 GHz or equivalent AMD Athlon® processor
1 GB RAM
1280 x 1024 monitor and display adapter capable [...]
Continue reading about Revit Architecture 2009 System Requirements
There is a pretty exhaustive list of what you need before installing AutoCAD 2009 posted by Shaan Hurley.
Here is the crux of it…
32-bit AutoCAD 2009
Running under Windows XP:
Microsoft Windows XP SP2 operating system
Intel® Pentium® 4 processor or AMD Athlon®, 2.2 GHz or greater
or
Intel or AMD Dual Core processor, 1.6 GHz or greater
1 GB RAM
750 MB [...]
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