A while back I got a legit copy of windows 7 and installed it on my computer. I have since put together a new system and had to reinstall windows seven using the same installation disk. Because I had already used the activation code once before and the version I bought said it was only good for one activation, I typed in the code while installing windows 7 disconnected from the internet so it wouldn't automatically check. I haven't had any problems with it until today when my wallpaper was set to black and a window popped up telling me I was a victim of software piracy and my copy of Windows 7 wasn't valid.
I know it is valid, and I don't feel like I should have to buy another copy to reinstall windows on a new computer while using the hard drive it was originally installed on. That is bullshit. So, how can I fix this? Will it let me validate it online? Can I just keep ignoring it? I mean they can't just like not let me boot any more right?
Tl;dr: how can I validate a genuine copy of windows I've already installed once, or do I even need to?