I have isolated my strange Win7 install issues to adding large files to the install source. I'm not talking about the install.wim exceeding 4GB, the latest oscdimg with UDF support gets past that issue no problem. Specifically, in the interests of trying to contain my universal unattended windows 7 install to the size of a DL-DVD, I am trying to utilize a 2.6GB Office 2010 switchless installer I made (otherwise it's > 3.5GB of uncompressed files/folders). If, and only if, I place the Office 2010 installer in my source and create the iso I get random, odd errors in Windows 7 setup - and so I'm wondering if the ISO structure breaks if you have any files on the DVD that are huge other than the WIMs? The error I get now is that the disk cant be found and needs to load a driver. I take out the 2.6GB installer, all is well.