Hello!
I had the same problem too. I can't access popular sites such as Google, YouTube, Twitter, Facebook, Hotmail and etc. I get a message saying, "Attention Required", then it says to unlock the site by completing a survey. All online surveys are fake and scams. When I'm on the page that says Attention Required, I right-click on the page and Inspect Element and seen a link to FileIce, and FileIce is website to download files by completing a scam survey that requires personal information which you should not do.
This is NOT a virus. This is classified as a trojan.
A detection of Win32/PossibleHostsFileHijack is an indicator that your HOSTS file may have been modified by malicious or potentially unwanted software. Modifications to the HOSTS file can cause access to certain Internet domains to be redirected or denied. This may prevent the computer from connecting to certain websites.
To recover manually from Win32/PossibleHostsFileHijack, you can manually recreate a clean HOSTS file, or you can restore a version of the HOSTS file from a backup you made before the file was modified without your consent.
Here is how to fix it:
1. Clear all browsers history, cookies, cache and data from the beginning of time
2. Make sure you have no adware, freeware or a suspicious browser extension & add-on that you did not install
3. Run a full-computer security scan using your Anti-Virus or Internet Security software. I recommend AVG, Avira, Avast, Adaware, Malwarebytes, Microsoft Security Essentials and McAfee, clear all viruses
4. Go do a Disk Defragment. To do this go to Start > All Programs > Accessories > System Tools > Disk Defragment
5. Now I've learned that the Attention Required message is a Windows Host File hijacking. Check your Hosts file in System32 (C:\WINDOWS\System32\drivers\etc\hosts) open with Notepad with UAC (User Access Control) and see if it has a list of popular sites, if so you have the virus problem.
** Use Microsoft's FixIt program at:
http://support.microsoft.com/kb/972034 this program will restore your Hosts file to default and remove the Attention Require message.
Next time make sure you:
- Don't download pirated software
- Use trusted websites
- Don't use websites that requires you to do a survey to unlock something
- Check your Hosts file weekly for safety & security reasons
* Please note Step 5 is very important, that is the main solution. Also the Windows host file is an important file in your computer, you should never modify it or edit it as it may defect your computer.
http://www.microsoft.com/security/portal/threat/encyclopedia/entry.aspx?Name=SettingsModifier%3aWin32%2fPossibleHostsFileHijack