Microsoft messing me around with Windows 10-not sure what is going on

Hi,
I have a laptop with Windows 7. A few weeks ago I suddenly found that Windows had appeared, I had not requested it-I assume that I must have ignored a message from MS saying that they were about to upgrade.
I didn't really like it it messed up some activities but it appeared to be a bit quicker. Yesterday my pointer(mouse) stopped working so I managed to reboot it. The pointer re-appeared but I suddenly found that my desktop picture had disappeared, I then found all "links" from programs to data had all disappeared in fact my "documents" folder was empty. It seemed that W10 had completed the activation and left me in the lurch. Amongst problems were, no bookmarks or history for Mozzilla firefox, access to other computers in the network suddenly required an unknown user name & password, my editing video program lost its links. I managed to find the bookmarks and the files for my video editing program. I left everything else.
This morning when I switched on my laptop everything was back to normal - the desktop picture was back and everything seems okay. What an is going on?

Hi Brink,
Thanks for your quick response.

I would probably have preferred to go back - then I would know what was going on. I was told that if I did some of my files may get lost - unlikely but diffcult to confirm or otherwise. Also it seemed sensible to convert to W10 before MS start charging for it. I would have left it a few months so that I could check with friends who might have converted for their experiences.
The event yesterday included loss of many activities from the 4 box thing (which I assume is the new start button). This included no "control panel" in fact very little there at all.
How could it have got out of Sync? Or set up a temporary account - I agree that something of that sort probably happened. How did it recover today and, probably more important, can it happen again?
Regards,
Peter

Hi Brink,
I suspect I am too late to go back to Windows 7. I think I found the bookmarks for firefox in a .old file. I cannot find any .old files today. Very odd.

I mentioned that today my system seems to have reverted to the situation before the loss of data links etc. Once I restablished the links including finding the video file I was editing using Pinnacle Studio, I continued editing that file. I saved the file last night.
Now that everything has gone back to where it was I discover that the editing I did last night has disappeared. How did W10 manage rollback those amendments from my datafiles. Windows 10 is clearly in an unstable state and thanks to Microsoft's unwanted action to upgrade me without my permission I am potentially in a mess. I no longer trust this operating system. Any ideas how I can prevent Sundays mess occuring again please?

Brink and others,
Thanks for responses, now seems okay - still confused as to why the temporary blip occurred. The rollback is partially explained. I forgot that when I edited my video file on Sunday - the Temporary odd situation , I changed the name of the file in case it was currupt. I forgot this and on Monday when , normality returned (sort of!) the "last file updated" must have been "rolled back" to the original file. So Pinnacle was editing the original copy of the file.
I will do a back up of my files in case this occurs again. Still don't fully understand W10, I will have to read it up when I get time. I am very busy as chairman of the LEO computers Society (a historical Society commemorating the World's first business computer LEO l).