My parents fell victim to these horrible ppl.

received call from "windows service center". sounded like he was from India. Very Very pushy and was mad I didn't fall for this. Tried to call back to verify, surprise. NO answer.

Just had the same thing; said he knew my system had errors??? How would they know that??? I have System Mechanic and it's not saying I have any issues.

They are a fraud, plain and simple. How could they possibly connect your phone number to your computer (unless you are using dial -up).
They call random numbers and hope to catch someone that is uninformed.

They called my home number claiming that my girlfriends PC was putting out spam and viruses and they needed access to it. They almost had her convinced but she emailed me at work. We have six PC's running through the same router, so I explained to her that there is no way to trace our IP address much less which PC and associate it with our phone number.
I do have one question for these scum sucking filthy untouchables, "Jab tu paida hua tho aagey se ya peechey se nikla tha chutiya?"