I have Norton through Concast. I have on NUMEROUS occasions received a 8504,104 Error message. Power eraser has been ran with minimal sucess. I have had 2 runs from my Windows registry internal system telling me that I have corruption within my system and to get it checked. I also had feedback from Mozilla telling me I had issues with my system. Each time I called Norton and I was reassured that "they were just trying to sell me their product" My system was secure and there was no infections within my system. This is my 4th computer in 1 year so you can understand my anxiety....don't want to buy another one. So my concern is HOW did I get this:
Ransomware.UkashVirus/FBI Moneypak is a ransomeware alert claiming that your PC is blocked. Once installed,Ukash Virus/FBI Moneypakwill display a scary fake alert stating that your are visiting ilegalwebsits.UkashVirus/FBIMoneypak completeely locks your system so you will not be able to preform any tasks. SetStretch.exe along with 7 other cookies with double click and goes on.
When I do scans constatntly on my system. check this address for virus and malware info http://www.ic3.gov/media/2012/121130.aspx