The power went out this weekend for 28 hours and when it came on, I always get a message on my Windows 7 desktop: "your computer was unable to start" and it asks me if I want to launch startup repair but every time I say yes, it will be stuck on "attempting repairs" and it will say that for hours on end and will never complete. if I click, "cancel" it always says that the repairs cannot be canceled. all I can do is pull the plug. but it does the same "your computer was unable to start" when I turn on the computer again. it was working fine before the power failure. it has been doing these same things all day every day since Sunday when power was restored. What can I do to remedy this? there was nothing wrong with the computer before the outage.