I received a phone call from a Mike (Indian by the sound of his voice) purporting to be a Windows employee, phone number 800 642 7676, informing me that my computer was leaking information, is this an attempted scam?
Definitely a scam. Microsoft has no way of knowing what any specific computer in the world is doing. These scammers know that almost any phone number they call will have a Windows computer. So they try to scare you into thinking there is a problem on your computer that they will fix for a fee. Then they ask for remote access to your computer and if you allow it, they can install malware that may steal your personal information. They then use that for identity theft.
Never, never accept any calls like this.