I would suggest downloading HiJackThis. There is a special tool for removing the above file.
Pls. have a look what to do here:
Good Luck !
My computer has been taken over by this virus. Windows Onecare scan tells me it is stored here c:\windows\system32\drivers\core.sys
Cannot be removed by windows onecare, windows defender doesn't even find it and clamwin doesn't find it. Running windows xp, help with removing please!