Hi, everyone! My younger sister was using my laptop last night and now it will not start up. It is a Vista from HP.
Whenever I turn it on it automatically goes to this message:
"Windows failed to start. A recent hardware or software change might be the cause.
If Windows files have been damaged or configured incorrectly, Startup Repair can help diagnose and fix the problem. If power was interrupted during startup, choose Start Windows Normally.
(Use the arrow keys to highlight your choice.)
Launch Startup Repair (recommended)
Start Windows Normally"
If I choose Launch Startup Repair it asks for an installation disc, but I do not have one. If I choose Start Windows Normally it gets to the green loading bar and stays there.
I have tried starting it up in Safe Mode, but it does not let me. It only starts loading some data, but gets stuck and never finishes. I have also tried Last Known Good Configuration, but it gets stuck on the green loading bar.
Is there any way I can fix this without losing any of my files? I do not care about losing programs, but the files are very important to me. Should I call HP instead?
I do not understand a lot about computers so please be patient with me.

Thanks!!