How did my computer get a virus?

you was probably logged n on some farm sex porn site while having jerk fest,, and downloaded the virus on those porn sites that your watching

Safe mode does not mean it's 'safe'; it means any add-on's are disabled. You may be the victim of the Microsoft hack of Firefox, which enables the 'iFrame' functionality to be incorporated into Firefox. Check your FF> Tools> Add-on's> Extensions: look for "NET Framework" or other Microsoft trash; also look in "Plug-in's" for other rubbish that you did not specifically request be installed. ("Active scripting" related junk). This allows a webpage to install software to your system, which may or may not be malicious; you have no way of knowing. In effect, it's an "Open Door" policy, and subjects you to 'Drive By installs', 'Opacity based attacks', and so on. Compromised websites (from whatever source) have 'assets' (different elements that make up the requested page); some 1st party; some 3rd party. Whenever a page is displayed, the user's web browser will interpret the page, discover the URL address of the asset server, and request that asset. This could be an image, flash animation, video, text, or other resource from the third-party server. Since browsers run 'on the fly', making no distinction between text and active scripting, malware (remote code execution) can be deployed into the receiving machine as the requested asset, and the malware is installed. So, enabled 'active scritping' and unblocked 3rd party cookies (aka 'assets') result in malware dutifully delivered and installed. One of the best ways to avoid malware being installed from the internet is to use Firefox with 'NoScript' add-on as your primary browser, and fall back on IE as a last resort, to view or interact with a sub-standard webpage. Switch back to FF when finished. Firefox: http://www.mozilla.com/en-US/firefox/ "NoScript" add-on: https://addons.mozilla.org/en-US/firefox/search?q=Noscript&cat=all Run all applications inside 'Sandboxie' for even better security: http://www.sandboxie.com/ Intentional downloads from peer-2-peer sites; clicking links from known badware sources (social networking); allowing 'Active X' controls; and so on, will ultimately defeat any security barriers. Using a security 'suite' with all-in-one features is not the blanket coverage they purport; nor is it a free ticket for willy-nilly behavior. Another serious oversight is surfing while logged in on an 'Administrative' account. The cleverness of the crafters of malware, means you must at all times know what current, real time threats are & counter-measures. Combined real-time barriers, system configurations and user habits are your best first line of defense.