How To Kill A SYSTEM Process?

For you Unix weenies (like me) how do you 'kill -9' a process on Windows XP Home edition? For everyone else (and especially Mr. Gates): How do you kill a process through Task Manager that is owned by SYSTEM? It is a BitDefender (virus scan) process (vsserv.exe) and I occasionally want to kill it just to get some work done on my machine. Task Manager says permisson denied when I try to kill it but I am an administrator on the machine.I tried creating a user account called SYSTEM and one called Administrator (to try and kill it by tricking Bill...oops sorry Mr. G) but in both cases Windows wouldn't create the account because it said an account already exists with that name. Well there are three user accounts created and they ain't Administrator or SYSTEM!