'Tis a good start.

You may download the aswMBR.exe file using another computer/connection/network and transfer the file over to your sick system via an USB stick. Be sure to use this program to prevent malware from entering the usb stick and infecting other systems if you do; or a blank cd will work just fine: http://www.mcshield.net/downloads.html I’d install this on all systems and allow it to update for protection prior to using an usb stick.