I would like to clarify what you said because I installed Win7 myself.
It comes in a box with DVDs for 32 and 64 bit. For a lot of people (not me) it may be hard to find out what version you want to install. The install took at least an hour of rebooting and took place in low resolution. Then you can create your account. Then you need to install updates (reboot). Then when you open windows again, THERE ARE MORE UPDATES WHICH MEANS I HAVE TO REBOOT AGAIN!!! Almost every time I open windows, there are updates. And even if I can read the license code, it's still a pain. And then I need to go hunting around the internet for all the apps I need.
So in short: no USB key, no 15 minute install, you don't get the apps you need preinstalled, and the license code IS a pain.
Don't bother with Windows. Get a Mac or Linux.