Microsoft uncovers scary virus

Writing in the Microsoft Malware Protection Center bog, Chun Feng said that if your system does get infected with Trojan:Win32/Popureb.E, it advises you to fix the MBR and then use a recovery CD to restore your system to a pre-infected state.

Apparently Popureb overwrites the hard drive's master boot record (MBR), the first sector where code is stored to bootstrap the operating system after the computer's BIOS does its start-up checks. It is invisible to both the operating system and any security software.

Source: Tech Eye