virus removal help

[komal <agencies_ad1 () sancharnet in>]

Hi!
My computer was infected by html.redoff virus. I deleted every html and at
last format my computer but while installing windows I receive warning
message that your boot sector is about to be modified if I press yes then at
next reboot my system directory is deleted and I am unable to start my
machine if I press other keys then I boot and work but in device manger my
primary controller is disabled (I.e yellow icon) .I have installed latest
anti virus .
Any help will be appreciated

Thank you
komal




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