Some fool called saying he was from "World PC tech" and insisting I had "things inside my computer" that shouldn't be there, but (through the bigness of his heart, I imagine) he would show me how to get rid of them...for free!  He wouldn't tell me the website of his company even after I told him I googled his company name and got nothing.  He kept insisting on walking me through the computer managment screen and issuing dire warnings about what was there and how only he - or his supervisor - could fix them.  I let him ramble on a while and then asked him if he really thought I would let some random caller tell me what to do with my computer?  He got offended.  i hung up.