Trojan / Spyware / McAfee

I am running Mcafee Security Center on my P.C. -got the free three years as well. I have no spyware software etc. Which one should I start with?

-reckon I will start with Microsoft Windows Defender beta 2 -anybody care to comment?
Seems to me like a good one to start with. It's FREE and it has updates.
 
I downloaded Defender yesterday and ran full scan and all clear.
Sorry if this sounds very basic but every time I click the Defender icon on my desktop i get windows defender maintenance wizard and it's like it wants to do an install again. Is it meant tobe like this?
If I go to start and then all programmes it seems to open up normally like all my other programmes.
 
The icon on the desktop is for install only.You can right click it and delete it.There should be an icon in the task bar beside the clock. Right click that icon and then click open main window to acess the programme.
 
Thanks caff the icon does not show on the taskbar because I have "only if windows defender detects an action to take" ticked which is fine.
You have answered my question regards icon on desktop.