Mumma Cat got caught up in a "Teamviewer scam". Someone called her claiming to be from "the ISP", saying something about them working for BT, TalkTalk and some others. They then said "your computer has over 500 viruses on it, because you don't have any protection". They then got her to turn her computer on and download Teamviewer. The scammers then get remote control access of her computer and show her something that "confirms the problem".
A quick look on t'internet shows lots of people saying the same thing. Apparently the scammers call back, and start asking for money to fix the problem. It's unclear if they install keyloggers, viruses or botnet software on your computer - we're taking no chances.