Windows 7 was the best Windows and one of the reasons was that you could still have the Windows 2000 GUI, the "Classic" theme. That was peak Windows.

I'm so disappointed that all those years later, the Windows UI is literally less configurable than Windows 2.1, which is the earliest version I used. Yeah, I don't miss 16-color mode, but I definitely miss that you had so much flexibility to tweak the UI. Now you're just stuck with some art-school dropout's idea of "flat UI" (seeing as how Microsoft has thrown out most of the great HCI work they, IBM, and others did in the 1980s, in favor of lame aesthetics that are entirely orthogonal to usability) and there's almost nothing meaningful you can change about it.