Hi, I've installed Virtualbox to run Win7-64bit. However, I've gone through the whole process only to see the error "no bootable medium found". I'm guessing this is something to do with my copy of Win7 which I created using Imgburn from a .img file on my PC. The Win7 DVD I created now has setup1.box, setup2.box and Win7-P-Retail-en-us-x64 files on there. So, if I clicked the Win7 file on a Windows machine it would allow me to install but VirtualBox doesn't appear to like it.. Any ideas where I've gone wrong? Thanks. PS - I have a 2011 MacBook Pro 15" 2.2..