Only able to open HTTPS sites on my Mac

Hi -
I am only able to open HTTPS websites on my FF (17.0.8) and Safari(6.0.5). None of the HTTP sites are opeing in these broswers.
Things I followed to troubleshoot this problem..
I have Installed/Uninstalled FF & Java
Clear firewall setting
Rebuild Network Configuration
Created New User
****Booting in Safe Mode
Note***: In Safe Mode my issue was resolved. I was able to access HTTP Sites in Safe Mode and it worked even after rebooting. But when I rebooted my machine for the second time it again stopped accessing HTTP Sites.
Please Help.
Kind Regards,
Susheel

Try checking your host files they may be set up wrong.
The file is in /etc/hosts, I recommend opening by either opening a terminal and typing 'nano /etc/hosts' or using the program TextWrangler downloaded from the website, not the App store.
There should only be a few lines, the ones that start with # are comments, ignore them. Then there should be 4 lines probably 127...,255...,::1..., and some random numbers. Delete anything else.

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