Lost scores

I had to get a new computer several months ago due to problems with my old one and since I got this one, any new score that I've started or continued with, has automatically created and gone into a second score folder and I couldn't figure out how to put all my scores in one folder! Well now suddenly that second folder and all the scores therein are now gone even though I never actively deleted them and I am very upset about it! I'm hoping there is some way I can recover my lost scores because this is very unacceptable and I don't know who or what is responsible for this!