i am trying to find what is happening to my laptop

I have a lenovo and purchased windows10 ms office .1 yr ago . ireside with a person using a 13 yr old sony now desktop. my files have seemed to have been breach since he takes his to a person that reinstalls all programs. well since then all kinds of information on the lenovo including wifi and ms and now windows .can anyone help. I believe he is trying to track me to cancer center. also apt hunting?