id,summary,reporter,owner,description,type,status,component,version,resolution,keywords,cc,guest,host 8514,Virtualbox USB Error. Failed to attach Unknown Device on Win7 x64 Enterprise Host.,Dave,,"This is in reference to this post: http://forums.virtualbox.org/viewtopic.php?f=6&t=39753#p178233 No matter what version of Virtualbox I use, with 'Extension Pack' installed on v4.0.0+, I continuously get a 'Failed to attach the USB Device Unknown device' message when booting up any guest OS. I'm running Win7 x64 Enterprise and I tried 'Admin Mode' and 'Compatibility Mode'. Nada. ",defect,closed,USB,VirtualBox 4.0.4,obsolete,"USB, Failed to attach unknown device, win7, x64, enterprise",,other,Windows