caller (indian accent) claimed to be named John with PC Wizard.
Asked me if I had a computer. Was confused when I said 'I have several computers'.
Said, in poor english, that my computer was infected with many things that slow it down and he would help me fix it.
I said 'I have been programming computers since 1964' and 'you owe me money because you just called a number of the Federal 'Do Not Call List'.
He hung up.
Google for
PC Wizard scam
They clearly are.

dude called with a heavy accent, from PC Wizards. he asked for my mother, but i told him she was at work so he asked me i had a computer, baffled i said yes he asked if i was infront of it i told him no i was getting ready to go get kids from school, he said thank you and hung up, before i could take a msg.