Avast comes up with a blocked site and the following message
object 199.80.55.80/go.php?data=C%FnlhyxNh9nGqXr21HAWMXBM9Z2
URL:Mal
Action taken was "BLOCKED"
Process: C:\Windows\system32\svchost.exe
Also every once in a while a new tab will open with some awards site and Avast will pop up with a trojan alert. Full scans with Avast (boot scan) and ESET reveal no threats.