Is Microsoft Security Essentials that we use for Windows 7 suitable for Windows 10 ?? Or Will a new patch be installed along with Windows 10 Upgrade. I am very much concerned about Internet Security. Thanks a million in advance for answering this query .. 

Windows 10 includes the successor to Microsoft Security Essentials called Windows Defender.

How to enable and use the built in Windows Defender for Antivirus Protection in Windows 10