The data released Monday shows that viruses were most prevalent in Bulgaria, where 58 percent of Internet users were hit in 2010, followed by Hungary, with 47 percent of users effected.

The safest countries were Austria, where only 14 percent of users reported a virus, and Ireland, where only 15 percent got one.

The data also shows that only 14 percent of households with children had parental controls on their computers and that five percent of adults have found children using inappropriate websites.