If your machine is infected your best bet is to re-install the operating system. You could try logging into the machine in safe mode, This is usually done by restarting the pc and after or during the Asus splash screen keep hitting f8 until a black screen comes on with white writing. one of the options should say Start safe mode. Select that option and see if you can logon, if you can and you dont have a problem try running your anti virus scanner again while in safe mode.
Please let me know how it goes. There are other things I can get you to try just message back.