One of the imacs where I work can not google search, yahoo, and other select sites in Safari or Firefox. It can go to Apple homepage and some other sites. I looked in Safari prefs/security and where it is checked for warn me about fradulent sites, there's a yellow triangle below it with exclamation point inside and the message: The Google Safe Browsing Service is unavailable. No updates have occurred in 1 day. Any ideas what is going on? If I do a google search of the problem on another imac, most of the suggested answers are that the computer is infected with spyware or virus. I've already zapped the pram, reset Safari, cleared the cache, fixed permissions etc. The co-worker says she has not installed any programs on the mac or downloaded anything.