This may not help you, but it lets you know what is possible. Once I got a phone call that was threatening me physically. It shocked me because I had nothing going on in my life that would have explained it. I immediately called the police and two officers came to my apartment. They used my phone to call the local phone company. The officer told the phone company he wanted the numbers, names and addresses of any calls made to me that morning. I had only had the one call. He immediately had that info on the caller. He told me the name and address of where the call had come from, asking me if that info rang a bell with me. It didn't. All we could note was that the address was an apartment a few miles from mine. Next the phone company told me what to do so that they could trace any disturbing calls. The plan was for them to give any info to the police (not directly to me.) I never got another crazy call, but I was glad to know what a thorough response the situation would be given. The police couldn't have been nicer.

BTW, I don't think "Windows Internet" is a company. If he had said "Microsoft" or the name of your Internet service provider, it would make more sense. (Though not much more.) It's definitely a scam. Spooky, isn't it, when the scam involves calling you at home. The phone company should do more. Meanwhile, whenever you hear his voice, just hang up. He'll get bored.