Firefox has a way to remove this plague if you have it.
Blekko is a redirector that is hijacking your browser and changing its configuration.
You probably got this thing when you were downloading something from CNET (coming as an additional tool) or was accessing some website with malicious domains.
This works as an engine, but redirects you to some malicious websites, in order to gain traffic for spam websites, containing fake ads or scams!
Go to this page.
And you'll be able to choose what solution works best for you. In my case, I did the following (because I knew that the issue was on ff, chrome was working fine).
on the address bar, type about: config.
You'll get a warning message, go ahead (but be careful or else)!!!
On the search field, type "keyword"
You'll see the blekko redirection on the "keyworld.url" item. Click twice and change it to http://www.google.com/search?q=.
Close the tab (please don't do anything else) and try to type something on the address bar. It'll go to google (Hopefully).
Just reminding, that worked on my case, maybe it could not work on yours!!!
