I have recently returned home and have started reusing my TOSHIBA Satellite Pro laptop running Windows Vista =(. I recently ran 'Windows Malicious Software Removal Tool' and it found "Trojan:Win32/Alureon.EP". I only have AVG basic on my computer and it could not find anything. I am going to Upgrade windows vista to Windows 7. If I do this will any virus or other malicious software still be present and if so how can I full clean my laptop and external hard drives/usb's?