threat defense

The last computer problem I let a friend help me see, today I went to play when friends home and told me that she fixed my computer so I try to get back, listening to a friend about what I said in my computer I think bad repair how to fix her yes, a friend told me that my computer is to install threat Defense said and put some parts inside the computer for good, listening to a friend about what I said before I also give the computer installed threat defense but does not play any role, I heard friends say that she then change some parts will be good, I heard friends say that she is really good.