I actually want to do a full system restore because the "OTHER" option of my mac usage is eating half of my memory and I couldnt do anything to get rid of them.
I think you are maybe over reacting to something that is not a problem. The "Other" designation covers anything beyond audio, movie, photo, apps, and backups. That still leaves a sizeable chunk of files that represent OSX and system related software that can't be classified into of the specific groups. If you're referring to something like the attached, it's normal: