This one (Compaq laptop running Windows seven) has been wonky, so I go into the diagnostic/repair sections to see what I can see. Gawd. The words are in English, I guess, but it's mostly jargon. So I muddle through some of that, feeling like a blind man in a dark cave. I finally threw up my hands and said ENOUGH!
Funny thing, it does seem to be running a bit better. I just wish I knew why. I have no idea.