You can use the Windows Control Panel to uninstall Microsoft Security Essentials. To do this, go to Start menu – Control Panel, and then select Add or Remove Programs.
In the list of applications, locate Microsoft Security Essentials and double-click it. To uninstall the program, follow the instructions that appear on the screen. After you apply all the changes, restart the computer.
If the application does not appear in the Add or Remove Programs panel, manually delete it. To do this, make a backup copy of the registry with the help of the regedit utility. Click Start. In the Find Programs and Files field, enter regedit and press Enter. Right-click My Computer, and select Export. Save the registry file to any folder convenient for you.
Stop all processes that are responsible for running Microsoft Security Essentials. To do this, call Start – Run. Then type the following command:
sc config msmpsvc start= disabled
In the regedit window, find the subkey HKEY_LOCAL_MACHINE, then SOFTWARE — Microsoft —Windows —CurrentVersion — Run. Right-click the Microsoft Security Essentials parameter and select Delete.
In the same CurrentVersion branch, go to Uninstall — Microsoft Security Client and delete Microsoft Antimalware items in the same way Service, Microsoft Antimalware, and Microsoft Security Client.
Go to HKEY_LOCAL_MACHINE SOFTWARE Microsoft Microsoft Security Client and delete the same line on the right side of the window. Then in HKEY_LOCAL_MACHINE SOFTWARE Microsoft Microsoft Antimalware similarly wipe the Microsoft Antimalware clause. Close all programs and restart your computer. Delete completed.