I've had both positive and negative ANA tests. Are they running further tests like for Lupus and RA? I had those done as well. I only had one Lupus test come back positive. That doesn't mean I have Lupus as it was more than likely a false positive.

About AVG, that happened to me and the cause was not necessarily a virus but something similar. I think it was called incredibar. It does weird searches. Anyhow, I went in to my add ons and turned off AVG search.