I maybe wrong but it appears you may not be test mode. Right click on the windows logo, click cmd as administrator and enter the command:
Bcdedit.exe -set TESTSIGNING ON
And restart your pc
Reply if this fixes the issue, you cannot leave test mode while the sli mod is enabled. Another fix may be disabling UAC. Sometimes uac must be disabled with regedit (this is an issue I have with my pc, but I doubt is your issue.
It's been in Test Mode ever since I upgraded to 10. I exited Test Mode for the first time when I tried seanstizz7's 18 step solution and it put me back into Test Mode after I did the patch. At least it says it is in the bottom right corner of the desktop.
As for UAC, I've had the slider down to the bottom since I started trying to sort this. I haven't used regedit to disable it however.