Norton is not detecting malware

I have discovereed that hwen uac is off, something starts making my mobile aircard use a ton of megabytes in just  few minutes. I ran a full system scan. It is set to run live updates. Norton said the pc is clean. This seems only to happen when User account control is turned off. I turned it off just trying to find out what was causing the right click copy paste explorer bug. It also would freeze when I tried to open itunes. I turned off uac and the problem went away. But this shows up.

Is there a way for notron to get rid of this? I'm using windows vista home premium 32bit.