I want to chime in here. It's advertisements on my desktop that repels me. There is something deeply personal about ads in my desktop that feels like being violated. This is a computer that I paid for, with software that I pay for, that includes all my most personal files and data. Seeing ads on the OS completely eroded my trust.

Of course, I still use Windows for various things, but I have too much "ick" for it to be the system where I check my email, manage my business, keep my important files, etc.

Windows is really great for lots of things, but I don't trust it.