MacBook Pro OSX 10.9.4

Hello,
I recently updated my OS to 10.9.4 and started getting some Internet problems after the install. Before the update, my Internet was working fine, but afterwards, my browsers (Safari and Chrome) started restricting website access. Now, I can only access sites associated with Google (google.com, youtube.com, etc.). I can input searches into Google, but I cannot access any of the URLs upon clicking them.
When I try to access the non-Google web pages on Safari, I get a blank white page (the loading bar is already full by then). When I try to access the same non-Google web pages on Chrome, I get a "No data received" error. The error code on Chrome is  "Error code: ERR_EMPTY_RESPONSE". I can access mail through the built-in mail application, and Network Diagnostics has repeatedly told me that I am connected to a functional Wi-Fi and that my Internet should be working properly, so I know that I am connected to a functional router. I have already tried clearing the DNS cache, but nothing's changed. I see that port 80 is open, so I know http is working.
To make sure that this isn't a router problem, I've tried to connect to non-Google sites on my home network and work network (both on different routers) but got the same result on both.
Can someone please help me out and tell me what they think might be wrong with my network connection?
Thank you.

Hope apple can fix this soon if new patch 10.9.4 cause this.
Apple cannot fix problems they did not create. Eset and Avast are capable of doing nothing beneficial and can only cause problems. Uninstall it and determine if the problems subside.
Use Avast's uninstaller, which will remove it completely. Eset requires using the uninstaller included with its downloaded installation program (see screenshot):
Eset will also require manual techniques to uninstall components its uninstaller leaves behind, a common characteristic of poorly written software.
I am now can access an internet, with zero security.
It's a common misconception that you have "zero security" without junk such as Eset or Avast. OS X already includes robust protections against viruses and malware. Use your Mac the way it was intended to be used - without burdening it with useless garbage.

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