My laptop refuses to start

Here is what happens..
Once I press the power button, a blue screen passes fast and I usally manage to read "a problem was found and windows shut down in order to not harm your computer"

Then a black screen shows and 2 options appear "lanuch with start up repair (recomended) and "start windows normally"

When I click starts windows nomally I repeats the whole process again
and takes me to the black screen that I mentioned before

When I click launch with startup repair, it searches for problems and shows a box saying windows can't repair this computer automatically and asks me to send info to Microsoft..2 options are there "Send information (recommended) "don't send" I only tried Send cause I'm afraid I might do something wrong.

It loads and then says windows can not repair "If you have recently attached a device to this computer, such as camera or portable music player, remove it and restart your computer, If you continue to see this message contact your system administrator or computer manufacturer for assistance, click finish to shut down ur computer, and then I click finish and it shut down..The end.
Help me fix the problem without losing my files please. Thanks in advance.