Computer won't boot after using Defender offline

My computer will not boot anymore. I see online that many people had success on this site any. Any help is appreciated. Thank you

 

My brother got it to come on he said he formatted it I now have to update everything.

I am now sure what service pack was previously on it I am updating the computer today
The computer had Norton (360 or internet security) which did not find anything with a full system scan.
Defender found alureon which it was deleting. I went to turn the computer back on I could not proceed to the login page.
The computer would go to the start windows normally/launch startup repair screen. Once I click start normally it would go right back to that screen. When I tried Launch startup repair screen it would search and not find a solution.

I did not get a chance to try the safe mode boot but I did attempt to boot from last known good configuration. I think the computer may still be infected.

I was attempting to fix our main computer which I think is messing up other computers on the wifi. Any computer on our wifi get popups when we click a link. If I disconnect the main computer and run the wifi through my laptop we no longer get popups. Also if I take my laptop to a friends no popups. I hope this helps with any other trouble shooting.

 

Yes, that is where I am at everything work on it like before. I am not familiar with a repair install. He said he went into system recovery and was able to format it and it started working. Is there a way to check if the virus is gone the popups still exist.

 

It looks like I just purchased it and using it for the first time. I know we lost files/downloads but we can do without them.