How do I reactivate Windows Defenders on 8?

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Windows

Win8

Defender

I recently installed a trial for an alternative virus checker and have subsequently removed it. But I cannot reactivate Windows Defender - I'm using Windows 8.

The only reason online research offers is that there must be another AV piece running. What am I missing?

This is the output from SecurityCheck.exe:
Results of screen317's Security Check version 0.99.87
x86 (UAC is enabled)
Internet Explorer 10 [color=red][b]Out of date![/b][/color]
[b][u]``````````````Antivirus/Firewall Check:``````````````[/b][/u]
Windows Firewall Enabled!
Windows Defender
[size=1]WMI entry may not exist for antivirus; attempting automatic update.[/size]
[b][u]`````````Anti-malware/Other Utilities Check:`````````[/b][/u]
MVPS Hosts File
Spybot - Search & Destroy
CCleaner
Java 7 Update 60
Java SE Development Kit 7 Update 60
[color=red][b]Java version out of Date![/b][/color]
Adobe Flash Player 15.0.0.152
Adobe Reader XI
Mozilla Firefox (32.0.1)
Google Chrome 37.0.2062.103
Google Chrome 37.0.2062.120
[b][u]````````Process Check: objlist.exe by Laurent````````[/b][/u]
[b][color=red]Spybot Teatimer.exe is disabled![/color][/b]
[b][u]`````````````````System Health check`````````````````[/b][/u]
Total Fragmentation on Drive C::
[b][u]````````````````````End of Log``````````````````````[/b][/u]


I have also tried to reactivate in using the admin account - but this didnt get a response either. I have looked up the Windows defender service using MSCONFIG, where it is stopped but is not offering any options to restart it.