I received a phone call from someone claiming to be Microsoft is this Legit?

No this is a scam. There are several variants to this, sometimes it will be Microsoft, others times it will be from different computer manufacturers, in any case this is a complete scam in an attempt to connect to your computer and scare you into purchasing a fake service or to lock you out of your computer until you pay what amounts to a ransom. If you are unsure whether to trust a phone call or email give us a call and we will do our best to help.