Hi everyone, New here and new at this. Thanks for all the great info - I'm reading stickies and struggling with some basic concepts. Sorry for the dumb questions ahead of time. I bought two Windows 7 Premium upgrade licenses for our two main machines. Haven't gotten around to installing but I have them. I also have an older Dell 8400 which has been running one of the Win7 RCs on it for a while, so I know it works. A friend order a newer Dell a few months ago and got a (Dell) Win7 Upgrade disk and gave (well... loaned) it to me. He's in no hurry to upgrade, if at all. The disk has a product key. First bank of questions: 1- Can I use the disk (and product key) to install Win7 on the old Dell (Dell A09 Phoenix BIOS dated 7/7/06?) 2- If I do so, can I still use the same disk to upgrade his very new (would it be preactivated?) machine? If the answer to either of these is 'no', and if I wanted to (for learning purposes! ) pursue flashing my BIOS (I've already downloaded it), could someone please point me to the correct part of the appropriate sticky where the steps are defined? This is where I'm stumbling trying to understand SLICs CERTs and KEYs. I'm not sure which I have and which I need given that I have a Dell upgrade disk and this is a Dell machine. Thanks in advance!