Win 7 and Vista have that window that pops up when programs are blocking shutdown after 5 seconds. It's the one with the Force Shutdown and Cancel buttons.
Is there a way to disable this screen? or at least increase the time before it occurs?
open this location HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control
change value of this key "WaitToKillServiceTimeout" between 2000-20000ms, where 2000 = 2sec.