Random Windef,WindSearch OFF and Win update issue..

[Uxot]

So..out of nowhere yesterday i got a red X in Wen Def..

"Threat service has stopped,Restart it now."

i click restart nothing happens i have to be in the page to restart to work..then its just the loading blue dots...tried to force start in services but then it gives me error:"windows could not start the windows defender service on local computer
Error 0x8007005: Access is denied."

Same for windows search (says index is off)
last thing is Windows Update issue:Window defender antivirus KB2267602 (Definition 1.275.1362.0)
It'sees to download and start installing but at 66% it gives this error:

Updates failed
Error 0x80070643
Tried Safemode:SCF,DSIM(or whatever the name),start-up repairs,regedit stuff etc...

Halp i just formatted a few days ago... and yes my Account is Admin.

[Uxot]

Yeah well windows defender still works today ill just uninstall Avira,thanks for the replies all.