Windows 8 Has Erased Apps / Files And Configuration Of HP Laptop?

I bought 2 years ago an HP 2000 NOTEBOOK PC, it came with windows 8 and when i turned it on today it was like new, there-s nothing left, except some programs in my desktop, but they are like new (example: when i opened word it asked my named)

Everything is like if i have never used it before, and I couldn't find any of my documents. I remember this happened like a year ago, but restarting it all came back to normality, but now it wont fix doing that

Any way to find my docx. by using the search options, and i have found them my docx. files, but i cant find a way to integrate them again to my system because if i search them from a windows folder i cant find any of them in my documents or my pictures, so this are my questions:

1) is there a way to put back my configuration, files, apps and everything as it was or i have to manually insert my documents in my system and forget my apps and configurations?

2) i read that i can use restore point and this wont affect my files, but if it goes wrong (the restore point option) is there a danger that i lost the opportunity to fix all my files and configuration? (I am asking this because i wont risk my work doing something that it might not be able to change). doing this restore point will be the solution to my problem or is this used for other typo of problems different than mine?

3) what do you think is the problem or the reason that this happens? I am worried that this has happened before and that it might happen again and as is very important to me i would want to prevent it.