Is there some other way to get a Windows 7 installation file legally?
I know there's an option on the microsoft website but it doesn't want my key for some reason, and won't give me the download without it. Other websites claim to have legal ISOs but they're either broken links or they re-direct to scummy looking websites instead.

I need to re-install my Windows 7 and I don't have my CD anymore. I'd pirate it but I imagine that Windows licenses are one of the few things you can't just pirate risk-free.