I think these answers are correct ... speculation over the second part.
1 - Windows-R, will bring up the 'Run' command; I am guessing that the next instructioon would be to run a program that 'proved' your system was running slow and then sold you the 'fix'
2 - If you phone a large number of people during late afternoon/evening and tell them 'I can see you're using your computer' then they will be right a significant minority (10-20%?) of the time. It's a bit like the Phishing emails which rely on the fact that if they send a million emails to random people stating that they need to send their password for Bank XYZ then a proportion of those getting the email will have an account with the bank.
I now do not enter telephone or email conversations with any company trying to sell me something that I have not initiated - it's easier, safer and gives me more of my evening back that way!
Ll