|First of the safe-mode option for "last known good configuration" is only useful when you install a driver and it makes the boot fail. |
To make sure you get all those viruses off I suggest using the Sophos command line interface you can download it here http://www.sophos.com/support/disin... Its a free tool just follow the instructions and you'll be all cleaned up. Also, if this isn't the first time I suggest looking up Sardu rescue disk http://www.sarducd.it/ just follow the instructions if you have any problems shoot me a message ill be glad to help ya.
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