Hi I'm new here; in fact this is my first post. I see Win7 Ultimate OEM. But it doens't specify the manufacturere, e.g. Dell, HP. 1. All OEM use the same ISO? 2. Can I switch OEM to VOL just by changing a few keys (ie. PID in Windows XP)? 3. I have Dell, HP, and Toshiba machines, should I play with OEM or a Retail? If OEM, where do I find the oembios files? Thanks!