Dude - if Windows crashes, the corrective action is just to reboot. You won't need to reinstall anything, unless you are defining a crash as a complete failure/corruption of the OS. If that's the case, you won't have any choice except to reinstall.
As for hiding Linux at bootup, you could always set the wait time to 0 seconds, but of course that would prevent anybody from ever booting up Linux.
My question to you: Why go through the trouble of setting up a dual boot Win/Linux system if you only want people to use Windows? -- J.W.