http://www.bleepingcomputer.com/tutorials/how-to-start-windows-in-safe-mode/ 

   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 

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

   "Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked

Boot the computer in Windows Safe Mode with network support (press F8 on the boot screen) as a test. http://www.bleepingcomputer.com/tutorials/how-to-start-windows-in-safe-mode/ 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