Do a malware check with some malware scan programs.<br /> You need to scan with all programs because each program detects different malware.<br /> Make sure that you update each program to get the latest version of the database before doing a scan.<br /> * http://www.malwarebytes.org/mbam.php - Malwarebytes' Anti-Malware * http://www.superantispyware.com/ - SuperAntispyware * http://www.microsoft.com/windows/products/winfamily/defender/default.mspx - Windows Defender: Home Page * http://www.safer-networking.org/en/index.html - Spybot Search & Destroy * http://www.lavasoft.com/products/ad_aware_free.php - Ad-Aware Free See also "Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked and [[Searches are redirected to another site]] ---- There are other things that need attention: *Firefox/3.6.12 NET_mmhpset You have or had an extension installed (NET_mmhpset) that has changed the user agent from Firefox/3.6.13 to Firefox/3.6.12. You can check the general.useragent prefs on the about:config page.<br /> You can open the about:config page via the location bar, just like you open a website.<br /> Filter: general.useragent<br /> If general.useragent prefs are bold (user set) then you can right-click that pref and choose Reset. See: *[[Web sites or add-ons incorrectly report incompatible browser]] ---- Your above posted system details show outdated plugin(s) with known security and stability risks that you should update. *Java Plug-in 1.6.0_13 for Netscape Navigator (DLL Helper) Update the [[Java]] plugin to the latest version. *http://www.oracle.com/technetwork/java/javase/downloads/index.html (Java Platform: Download JRE)

I eliminated this problem when I stopped using live weatherbug. Weatherbug uses their own browser and there is no way to stop popups when their browser is running. I deleted their software and now get my live weather from other sourses.