This message means that Windows has become corrupted -- so much so, that it can no longer boot. MS puts up this message to tell you that Windows will repair itself -- but in my experience of having seen this dozens of times over the years, it has NEVER been able to make those repairs. So it keeps rebooting and redisplaying this again and again -- until you get disgusted and turn off the PC!
This problem is nearly impossible to fix -- from the standpoint of making repairs and leaving your stuff intact. Some steps for trying this are listed below, but they are very hard to do and if they do not work, you are faced with doing a complete Windows reinstallation to get your PC back working again.
And if that is the case, you need to come back here and tell us what failed so we can provide instructions for things you can to do retrieve some data from your drive before you do a complete reinstallation. ----------
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