Get the error 404 on most but not all sites

Firefox only works randomly on some sites (e.g., Facebook was working earlier now not; yahoo mail works;) ( CNN.com is not). On all sites, I get

404 not found

Unable to connect to the host

If I use the Opera browser, everything works fine. I have cleared my history, updated Firefox and none of these help.

Make a check of malware with several malware scanning of programs on the Windows computer.
Please scan with all programs, because each program detects a different malicious program.
All of these programs have free versions.

Make sure that you update each program to get the latest version of their databases before scanning.

Alternatively, you can write a check for an infection rootkit TDSSKiller.

See also:

Tags: Firefox

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