My husband used to install cable internet. First of all if they are doing a good job they usually have to access your computer to make sure the modem is working okay. But the other thing is they have to check a variety of pages to make sure that they aren't just getting a cached page. He would doublecheck that it wasn't cached info that was loading and type in a web address the owner was not likely to have cached, i.e. some site he personally knew like his home page or whatnot. I guess I wouldn't have thought anything of it or even thought to check my history. As long as he wasn't looking into my personal info on the computer which is the reason I'd not let him be alone in here with it to begin with .