I have had the same problem and so far I have read that you can install .net 2.0 beta, what ever that is. I have been able to install my acad 2006 on xp64 by finding the file acad.msi and double clicking it. However, I am having problems registering the software online and I intend to call autocad Monday to register the software.
As a side note, I am upgrading from 2002 to 2006 and my acad 2002 had no problems installing running on xp64. If you know what .net 2.0 is let me know. I posted a similar question on the autodesk discussion page.
Thanks to all for putting me on right path
Dot Net framework allows internet based developments (such as Acad 2006) to run - something to do with the change in the Autodesk coding- http://www.microsoft.com/downloads/ has the NetFx64 fix 52Meg
I will download .net 2.0 thanks for the help. Just to let anyone know, I was finally able to get my authorization code and still had some program parts missing but, I was able to individually execute each setup.exe and successfully load the rest of the software. At this point it seems to be running OK. However, I need to really check it out with some of my more difficult drawings. Thanks again.
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