You get a call from India saying that your PC is badly infected. This has happened to me twice. They have you do this procedure:
1. Press windows symbol on keyboard and r. Run window appears.
2. Type eventvwr, click ok. (That’s event viewer, logs of what’s happened in the past.)
3. Choose Windows logs > Applications. (That’s a log of one type of event. There are about 5 others.)
4. A long list of entries appears. (In my case, over 50,000, going back over a year.) She told me these were all errors caused by my internet activity. Not true: almost all were just logs of events, including some past errors. They are for information only and do not mean that anything is wrong at present. (In my case, which is probably not typical, hundreds of errors from Bonjour appeared. Bonjour has something to do with iTunes, which I don’t use. Searching on “bonjour services” gave instructions about how to remove it, but the instructions could not get started.)
5. Each entry in eventvwr is a log file for a different kind of event. They do not do any harm by just being there. I cleared all by rt-clk except Windows, which cannot be cleared. For this they wanted $300, $200 or $100!
6. I can’t think of the name of the site where you can check such things. They may not have heard of this.