hello, unfortunately when you search for this error message it appears that it might be related to malware that is active on your system and blocks file downloads. please try to run a full scan of your system with different security tools like the [http://www.malwarebytes.org/products/malwarebytes_free free version of malwarebytes], [http://www.bleepingcomputer.com/download/adwcleaner/ adwcleaner], [http://www.microsoft.com/security/scanner/default.aspx microsoft safety scanner] & [http://www.kaspersky.com/security-scan kaspersky security scan]. if you can't download/execute any of those tools, you might want to try to boot windows into safe mode with networking support first and see if it works then: http://windows.microsoft.com/en-us/windows/start-computer-safe-mode#start-computer-safe-mode=windows-7 [[Troubleshoot Firefox issues caused by malware]]

I have a current version of Webroot Security Anywhere which I have run today without turning up any malware. Would it be that the initial settings in the operating system were too limiting?