Installation failed for me too. Started bootstrap installer from autodesk labs, download finished, installation finished and got failed installation.
No log file anywhere. No error message.
Windows XP SP3 with MS installer 4.5. AutoCAD 2011 beta works flawless, so I believe everything needed is there.
Zdenko Kozar
Education and tech support manager
PRIOR inženjering d.o.o.
http://www.prior.hr