Do a malware check with some malware scanning programs on the Windows computer.<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 their databases before doing a scan.<br /><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 ---- You can get a "Corrupted Content Error" error if there are multiple location redirects send via the HTTP response headers.<br /> Firefox doesn't allow that for security reasons. *[https://bugzilla.mozilla.org/show_bug.cgi?id=681140 bug 681140] - Corrupted Content error due to multiple Content-Disposition header field instances