COLGeek :
There could be remnants from ad-trackers that would leave such things. However, the most likely cause (not a virus) is actually visiting questionable sites.
What specifically are you trying to determine?
Im trying to figure out if im being snowballed or not. Claims that our ip address has been hijacked and that's why multiple devices have the same porn on them. (laptop, tablet, cell phone) however my laptop and phone have none of this. If its the ip address hacked, wouldn't all devices have the same stuff showing up on them?