Whether you can disable it (easily) depends on the keyboard and its driver (some cheap keyboards don’t even have a driver.) So it’s hard to answer.
There’s a way to disable it by hacking around in the registry, I think someone’s posted that.
The best solution is to set WOW to “fullscreen (windowed)” mode. Then the Windows key won’t mess you up and, as an added bonus, you won’t have any delay when you alt-tab to fiddle with something in the background or start a movie on your second monitor or whatever.
Why “fullscreen (windowed)” isn’t the default setting? That’s the real mystery.
I use a similar program. My current laptop’s keyboard came with some stupid function keys along the left edge (calculator, print, internet, and something I can no longer identify but which looks like it should produce a seagull), and I kept hitting them when I wanted tab or shift, so I just turned them into duplicates of the keys they were next to.
What, are you a daring soul that just doesn’t care what others do with your account while you step away for a minute? I suspect we’ll be hearing about how baggy your pants are any day now.
You clearly don’t live with the same people I do. My sons are dedicated online prankers. I don’t trust them around an open session under my identity as far as I could throw any of them.
But again, even if my family were sparklingly trustworth, I’d do it. It’s ingrained habit. Watching a young Second Lieutenant’s fledgling military career strangled in the cradle by a formal reprimand for leaving his console unlocked and unattended concentrates the mind wonderfully.
The only Windows computers I use are at my store, used as cash registers (I use Macs at home and for all other business purposes). I can see them pretty much at all times, and share them with whoever I have working with me that day, so I don’t lock them.