Adding large files (other than the WIM) to Windows 7 install corrupts in Unattended Windows 7/Server 2008R2 Posted March 19, 2011 I'm not even talking about actual burned media here. This is with mounted ISO's within a VM to test. I dont set anything. I extract the MSDN 7 SP1 x64 ISO to a directory and add updates/apps. I dont change anything else.As an aside, VirtualBox since v4 just plain sucks. Unreliable, unmitigated garbage. Had to move to VMware player to continue testing 64bit guests.