Treacle OS
I never did understand why any Windows program could write a whole load of crap into the registry.
Remember those AOL CDs that came in the post every week? If you were daft enough to install one a search of the registry revealed AOL in a zillion places, even after uninstalling it!
I got annoyed with the inevitable slow-down of my PC and moved to Linux after XP.
As mentioned above, MS's collusion with Hollywood and DRM was their downfall. I want to be the admin of my own machine.