I have also been called by these people. The clue is "how do these people know what's going on in my computer?". The answer is - they don't. They just want to get access to your computer and any secrets it holds!

Always be careful with telephone callers - don't just give your details out to anyone who asks for them - you have no idea who they are.

I am regularly called by various scammers - besides this computer scam, be very wary of surveys or questions of any kind, or people wanting to reset your online banking or confirm the password.

Be safe. Thanks for the reminder about this Frank, but do be very much more careful in general.