@Tono, If you loosed "...more than 2 years of work on my computer, including songs, photos, everything..." then... like DeViLbOi said, you should turn back to "explorer". Couldn't you simple reinstall windows above your current installation?
I think you didn’t take the time to read what you should do! There are many docs for LiteStep! You could use an installer!
… And this thread is in the wrong place!