Do they know something we dont?
A hardware store would be the first place I'd look for any type of lock. If you don't get good answers here, try the Home Garden category. Some of the subcategories there might work.
trustedantivirus /doc/download-free-anti-spyware/us/frt/0 / / scam website did install their junk, then go to start control panel add/remove programs and look for BestsellerAntivirus 2.1.335.1 - If you see that, then uninstall it.