INFO ON WIN-CIH
Here is some info that I have gathered about the WIN-CIH virus:
         Computers based on Intel-compatible processors use a Basic Input
   Output System (BIOS) to for cold start-ups. The BIOS is software that
   initializes and manages the data flow between the system devices,
   including the hard drive, serial and parallel ports, and the keyboard;
   it sits between those hardware devices and the operating system and
   applications.
       Most desktop, server, and notebook computers built in the last few
   years store their BIOS on a flash ROM chip. These flash chips are
   rewritable, which allows users and manufacturers to upgrade the BIOS
   with new capabilities, or to fix bugs.

       The CIH virus is the first to attack the software code stored in those
   flash BIOS chips. The virus overwrites part of the BIOS code that's
   stored in some flash ROM chips. In fact, it overwrites the part of the
   BIOS program that runs first when the system is powered up or reset.

       As a result, the virus can render your computer unbootable-- it just
   won't start up when you turn on the power.
 
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