Thanks for all your help.
You're quite welcome!
From what you have described it seems likely the infection came from a video containing a Flash Player or Windows vulnerability.
I have listed some information below on tools you can use to help reduce the chances of re-infection. When you reformat and install Windows your first priority should be to install an Anti-Virus program, then install all available Windows Updates and then install the tools below.
I will have this topic closed tomorrow but you will still be able to access it.
SiteAdvisor is a toolbar for Microsoft Internet Explorer and Mozilla Firefox which alerts you if you're about to enter a potentially dangerous website.
You can find more information and download it from Here Install WinPatrol
As a robust security monitor, WinPatrol
will alert you to hijackings, malware attacks and critical changes made to your computer without your permission. WinPatrol takes snapshot of your critical system resources and alerts you to any changes that may occur without your knowledge.
For more information, please visit HEREMVPS HostsInstall MVPS Hosts File From Here
The MVPS Hosts file replaces your current HOSTS file with one containing well know ad sites etc. Basically, this prevents your computer from connecting to those sites by redirecting them to 127.0.0.1 which is your local computer.You can Find the Tutorial HERE
Update your Antivirus programs and other security products regularly to avoid new threats that could infect your system.
You can use one of these sites to check if any updates are needed for your pc.Secunia Software InspectorF-secure Health CheckMicrosoft Windows Update
Microsoft releases patches for Windows and Office products regularly to patch up Windows and Office products loopholes and fix any bugs found. Install the updates immediately if they are found.To update Windows
Go to Start
> All Programs
> Windows Update
> Check for updates.To update Office
Open up any Office program.
Go to Help
> Check for Updates Read, stay informed.
To help minimize the chances of becoming re-infected, please read. Computer Security - a short guide to staying safer online