Please take note about the DNS Changer.
Artice from the FBI
Provide a Fix
For Mac try macscan.securemac.com
How can you fix, remove, and recover from a DNS Changer Violation?
Please take immediate steps to safe guard your computer and data if any of the test indicate that you might be violated with DNS Changer. If the Check-Up Site indicates that you are affected then either follow the instructions on that site or run one of the following free tools listed below to remove DNSChanger and related threats:
|Name of the Tool
|Hitman Pro (32bit and 64bit versions)
|Kaspersky Labs TDSSKiller
|Microsoft Windows Defender Offline
|Microsoft Safety Scanner
|Norton Power Eraser
|Trend Micro Housecall
|http://www.avira.com/en/support-for-home-knowledgebase-detail/kbid/1199 Avira’s DNS Repair-Tool