Okay, number one when you get a computer virus one doesn't erase their mother board, if it did you would have to purge the virus typically by buying a new board. Typically the hard drive is where the virus imbeds it's self. and scrammbles up the the drive, but before it does that the virus typically will reproduce it's self and attach itself to your outbound email to spread it's self. A sophistcated virus will automatically send itself out to all persons on your address list, and when the time is right for it to go off, it screws up your hard drive. In no way can the virus directly mess with your CPU or imbed it's self into your mother board. It is always imbeded on the hard drive, so that each time you turn on your computer it loads itself into higher memory, then and only then is it resident on your mother board. A really tough bug might be able to write it's self to your BIOS and remain in memory on the mother board, but it wouldn't be able to write itself to the CPU. Not a typical bug though. Get a decent anti virus program, update it weekly. And for sure get a fire wall setup to stop the damn thing from spreading it self automatically if you get one. Stay away from DSL unless you have good fire wall set up. Other wise you could get a virus downloaded to your machine while your not even home using your computer because your online all the time.