Hello, Please see the guide: * http://malwaretips.com/blogs/webalta-virus-removal/

You can check the target line in the Firefox desktop shortcut (right-click: Properties) to make sure that nothing is appended after the path to the Firefox program. You can open the <b>about:config</b> page via the location/address bar and search for prefs that refer to <b>webalta.ru</b>. You can reset user set (bold) prefs via the right-click context menu to the default value. *http://kb.mozillazine.org/about:config You can check if you have a user.js file in the profile folder to initialize prefs each time Firefox starts. *http://kb.mozillazine.org/Preferences_not_saved The user.js file is only present if you or other software has created this file and normally it wouldn't be there. You can check its content with a plain text editor (right-click: Open with) if you didn't create this file yourself. The user.js file is read each time Firefox is started and initializes preferences to the value specified in this file, so preferences set via user.js can only be changed temporarily for the current session.

Thank you for your help.Everything is working ok now. Thank you again