Just sharing an experience...
I've had my DAW for the past 2 years and I keep it connected to the internet for updates - Windows, plugins, etc...
While I can work with many software applications, I'm quite ignorant about what makes them tick.
My DAW would go through phases of restarting halfway through a cold start. Then I would be working on Sonar and one minute I'm recording next thing I know my DAW restarts on its own. Really bad crash like someone pulled out the plug on it.
So after months of blaming my computer, Sonar, bad drivers and everything in between except Win 7, I learned that some systems are "more sensitive" than others. My laptop (Win7 as well) which I keep as a "dirty computer" (internet browsing, emails, etc), never suffered a single glitch while my DAW which is obviously much more powerful, would be limping after certain Win updates. Then the problem goes away on its own when apparently MS decides to patch the previous faulty ones.
So yes, we're at their mercy. But yesterday's update didn't cause any problems for me though.