When your machine has been taken over by Blaster, your best option is to back up your data and perform a clean re-install of the operating system. Blaster introduces an administrative back-door into your computer, and the so-called "removal tools" may not actually remove all traces of the vulnerability. The only way to be sure that you have regained complete administrative control of the machine is to re-install the operating system. In the short term, you can try installing/re-installing the latest MS service pack to restore the missing Network/Internet functionality.
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