I have no idea how that got there

It says here that in Pennsylvania, anyway, if you take your computer back to the store for repairs, you have no "reasonable expectation of privacy," which means that if they find you've got scads and scads of smut — well, let's not go there. You're just going to have to do a better job of concealing the evidence — or keep it on a removable drive, fercryingoutloud.