Windows computer scam

Call was answered by my answering machine and the caller hung up.

Got  2 calls this week about 11 PM. Told them it was very late and I said I wasn't interested in their scam and hung up.

Always got a call from this number. This time I answered, he told me that my computer have virus and give me procedure to fix it. I told him that I'm wondering how they get my number, and told me that they got it when I registered to windows account. Told them that my phone number is new and not even a slight change that I use it to register into something. And if ever my computer have virus I will know it, he said that for the past day I got an error which I don't have. He insisting on following his procedure so that I will find it. Told him that I'm knowledgeable about computer software/ hardware since I took course about computer. Ask me what programs do I know, told him that I'm not going to say anything or give him info about me because I know that he is a scammer. He got frustrated and ask me about my facebook id. Yeah like I'm dumb. He told me that his going to hack my facebook and just wait. What evil person whose waiting to trap some one.