Sometimes the infection is so new that your antivirus program does not detect it.
The majority of these types of infections are called scareware.
They infect your machine by any number of methods that exploit weaknesses or vulnerabilities in your system.
Meanwhile it was just a bunch of smoke and mirrors.
The tool is called Norton Power Eraser.
The tool is meant as a last resort after all other methods have failed.
This is simply due to the fact that it does get a lot of false positives.
It is very aggressive and can potentially destroy applications.
But if you are already on the verge of formatting the machine this is a great last resort.
After downloading and running the 5.28MB installer file you will see a screen that looks like this.
By clicking on the orangescanbutton you will see two options.
I chose the option to scan a directory.
Then I would go for the drive from the online window and click OK.
I chose the D:\ drive and saw ascanning your computermessage across my screen as it scanned.
You have the option of creating a system restore point before making the changes.
Remember he who laughs last usually has a backup.
I will give it a shot when I can and let you know how it goes.