Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

Buscar en Ayuda

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Firefox will not let me get on any websites (safe AND not safe), claiming that it "may pose a security threat to your system"; when I try to choose the "proceed unprotected" option, it won't let me.

  • 4 respuestas
  • 170 tienen este problema
  • 2 visitas
  • Última respuesta de the-edmeister

more options

My computer's anti-virus software recently expired. A few days later, I went to download a new anti-virus software . . . when I opened up Firefox, I received a warning that claimed Firefox was infected with "Trojan-BNK.Win32.Keylogger.gen", and gave me two options: "Activate XP Security 2011 (recommended)" (this was a $60 charge and required credit card info) or "Continue unprotected (Dangerous)"

Since I needed to install new anti-virus, I figured I would continue unprotected, download my new software quickly, and remove the virus. But when Firefox opened, it gave me a message saying: "Firefox alert. Visiting this site may pose a security threat to your system!". Gave me three options:

1. "Get a copy of 'XP Security 2011' to safeguard your PC while surfing the web (RECOMMENDED)"

2. "Run a spyware, virus and malware scan" (I already did this)

3. "Continue surfing without any security measures (DANGEROUS)"

I tried clicking on different links, but the same warning kept showing up, even on verified and safe sites. I tried to choose the third option so that I could download my anti-virus software quickly, but nothing happened when I clicked on it - the page reloads and the warning shows up again.

My computer is still without anti-virus software because Firefox will not let me surf the internet. Please help!

My computer's anti-virus software recently expired. A few days later, I went to download a new anti-virus software . . . when I opened up Firefox, I received a warning that claimed Firefox was infected with "Trojan-BNK.Win32.Keylogger.gen", and gave me two options: "Activate XP Security 2011 (recommended)" (this was a $60 charge and required credit card info) or "Continue unprotected (Dangerous)" Since I needed to install new anti-virus, I figured I would continue unprotected, download my new software quickly, and remove the virus. But when Firefox opened, it gave me a message saying: "Firefox alert. Visiting this site may pose a security threat to your system!". Gave me three options: 1. "Get a copy of 'XP Security 2011' to safeguard your PC while surfing the web (RECOMMENDED)" 2. "Run a spyware, virus and malware scan" (I already did this) 3. "Continue surfing without any security measures (DANGEROUS)" I tried clicking on different links, but the same warning kept showing up, even on verified and safe sites. I tried to choose the third option so that I could download my anti-virus software quickly, but nothing happened when I clicked on it - the page reloads and the warning shows up again. My computer is still without anti-virus software because Firefox will not let me surf the internet. Please help!

Solución elegida

It sounds as though your PC is infected with fake antivirus software. The detailed cleanup instructions vary depending on which fake AV you have. However, as a first step, try this:

Download the following on a different PC, copy them to a USB flash drive or CD, and then run them on the infected PC:

Malwarebytes Anti-malware : http://www.malwarebytes.org/mbam.php

SUPERAntiSpyware : http://www.superantispyware.com/

Hopefully these will get you back online safely. If not, search for clean-up instructions for the specific malware.

Leer esta respuesta en su contexto 👍 16

Todas las respuestas (4)

more options

Has anyone found out what the issue is because it is really upsetting and I can't seem to get around it.

more options

Solución elegida

It sounds as though your PC is infected with fake antivirus software. The detailed cleanup instructions vary depending on which fake AV you have. However, as a first step, try this:

Download the following on a different PC, copy them to a USB flash drive or CD, and then run them on the infected PC:

Malwarebytes Anti-malware : http://www.malwarebytes.org/mbam.php

SUPERAntiSpyware : http://www.superantispyware.com/

Hopefully these will get you back online safely. If not, search for clean-up instructions for the specific malware.

more options

Your solution worked perfectly! Thank you!

more options

Please click the Helpful button next to the answer that solved your Firefox support issue, when you are logged in, so this thread gets marked as Solved to help other users who may have this same problem.