porblem accessing search engines

Hi... I have problems trying to load Google, Bing, and Yahoo search engines. I have Norton Anti Virus 2011 but it didn't detect any virus/malware after I installed it.  I have downloaded latest Anti malware by MalwareBytes.  Ran full scan and detected / removed 2 infections (security.hijack & rogue.InternetSecurityEssentials). Still the search problem is not resolved.

 

What is the cause of this problem? Appreciate input and solutions.

 

Thanks.