Purplo262

Today I went to change some things in my technic folder but it's completely gone? I used it just the other day so I'm sure I didn't accidentally delete it or anything. I opened the Launcher and it said I had to install it as if it was the first time I had downloaded it. I did and I have no modpacks, nothing. All my files, saves, textures, my own modpacks, gone. They're not in my recycling bin, I can't find them anywhere. I'm really not happy >:( What could have happened???