It's a crime!
The dodgy folk are now trying a new variation on the previously mentioned Microsoft Scam.They've obviously realised that word has got round that nobody is trusting the "I'm speaking from Windows" speech and now they've replaced it with "I am from Technical support at your Internet Service Provider", they say something along the lines of "we have noticed on our servers that each time you switch your computer on, you are not getting full internet speed and this is because of a virus on your machine. "