This is scam. When I asked where are you located, they hung up. Do not give out any info about yourself or your computer. No one should call to offer tech support if you did not call for it yourself!
This guy has an East Indian accent and said that his name is Ryan. He called last night and said that he worked for Microsoft and that we had a bad virus on our computer. If I would go to my computer, he would guide me step by step to getting rid of the virus. I did not place any call for technical help on our computer, and told him so. He said that they (Microsoft) were aware that we had the computer virus and he was trying to help me. I told him that we didn't need help. Since last night, there have been 2 more calls from this number today, but no message on the answering machine