If your computer had an unpatched exploit (old Flash, QuickTime, Java, etc.), then it wouldn’t have mattered what security suite you had installed. Exploits get around your antivirus using programs you told your antivirus were already clean, in essence.
You need two things. First, download a free antivirus CD image and burn it (Avira, F-Secure, and BitDefender each offer one). Boot with it on the bad computer and let it clean your system. If one doesn’t find it, burn the next one.
Second, once your system is clean, download and run Secunia PSI, which is also free. Let it find your known exploitable unpatched stuff and then install the patches.
Now, I happen to think the rogue antivirus you got is one I’ve seen several times before under very slightly different names. Usually, you visit a URL from a search engine that has been infected and it passes you to a site that sends your computer to a fake but real looking antivirus screen, saying it is scanning your system, which then “finds” dozens of viruses you don’t have. If you don’t kill this browser popup successfully (which normally means turning off javascript or killing the browser’s process in Task Manager), you are presented with a screen that asks you “permission” to clean your system. You don’t want to do anything to that window. If you do, well, you are screwed. Did you notice something like this?
Anyway, get a blank CD or two and burn the ISO images (Avira also has a .EXE version that has a built-in burning program) and you will be fine once again.
I don't think I gave any programs access to scan my system...but somehow that program did gain access!
good post thanks