I am buying a new ready-made PC without a SSD .I will add a SSD myself.The PC will come equipped with Microsoft office 2013 and McAfee 15 month antivirus and Windows 10 .I will buy a 128 GB SSD for Windows 10 and some games of (30-40 GB).I want to migrate only my OS and nothing else I will install games later on.So how do I migrate it