Hi, unfortunately not all programs will remove all malware, so please try any of these that you haven't already run -

• Microsoft Safety Scanner
• MalwareBytes' Anti-Malware
• Anti-Rootkit Utility - TDSSKiller
• AdwCleaner (for more info, see this alternate AdwCleaner download page)
• Hitman Pro
• ESET Online Scanner

Microsoft Security Essentials is a good permanent antivirus for Windows 7/Vista/XP if you don't already have one. Windows 8 has antivirus built-in already.

Further information can be found in the Troubleshoot Firefox issues caused by malware article.

After the malware has been removed, you may then need to reset your Home Page - How to set the home page.

Did this fix your problems? Please report back to us!

I try already : microsoft safety scanner adwcleaner kaspersky in normal mode and safe mode. I refresh Mozilla firefox, I deleted and reinstalled firefox in safe mode. No results. It seems this wpkg take command of the search engine and override all the other results. Moreover even I'm on a webpage such as italian tv La7.it just after few seconds firefox switch to the damned wkpg. here I copy some detail I got from this webpage Basic information Display title Main Page Default sort key Main Page Page length (in bytes) 2,484 Page ID 1 Page content language English (en) Page content model wikitext Indexing by robots Allowed Number of redirects to this page 0 Counted as a content page Yes Page protection Edit Allow only administrators Move Allow only administrators Edit history Page creator MediaWiki default (Talk) Date of page creation 12:41, 19 June 2005 Latest editor WPKGSysop (Talk | contribs) Date of latest edit 18:55, 14 May 2014 Total number of edits 92 Total number of distinct authors 8 Recent number of edits (within past 91 days) 0 Recent number of distinct authors 0

This post can help you. A lot of people have this problem from yesterday. http://www.reddit.com/r/China/comments/33wpk3/anyone_else_almost_all_websites_in_both_chrome/

I installed adblock plus from firefox Add-ons market and added a filter rule and the problem gone.

You can check in "Windows Control Panel > Programs" for recently installed programs to see if suspicious software shows up.

• Control Panel > Programs > Programs and Features > Uninstall or change a program
• Click the Installed column to sort by this heading

You can check for recently installed suspicious or unknown extensions.

• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

You can delete possible user.js and numbered prefs-##.js files and rename (or delete) the prefs.js file to reset all prefs to the default value including prefs set via user.js and prefs that are no longer supported in the current Firefox release.

• http://kb.mozillazine.org/Preferences_not_saved
• http://kb.mozillazine.org/Resetting_preferences

Do a malware check with several malware scanning programs on the Windows computer. Please scan with all programs because each program detects different malware. All these programs have free versions.

Make sure that you update each program to get the latest version of their databases before doing a scan.

• Malwarebytes' Anti-Malware:
  http://www.malwarebytes.org/mbam.php
• AdwCleaner:
  http://www.bleepingcomputer.com/download/adwcleaner/
  http://www.softpedia.com/get/Antivirus/Removal-Tools/AdwCleaner.shtml
• SuperAntispyware:
  http://www.superantispyware.com/
• Microsoft Safety Scanner:
  http://www.microsoft.com/security/scanner/en-us/default.aspx
• Windows Defender:
  http://windows.microsoft.com/en-us/windows/using-defender
• Spybot Search & Destroy:
  http://www.safer-networking.org/en/index.html
• Kasperky Free Security Scan:
  http://www.kaspersky.com/security-scan

You can also do a check for a rootkit infection with TDSSKiller.

• Anti-rootkit utility TDSSKiller:
  http://support.kaspersky.com/5350?el=88446

See also:

• "Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked
• https://support.mozilla.org/kb/troubleshoot-firefox-issues-caused-malware