access is denied

From: Tom (Tom_at_discussions.microsoft.com)
Date: 01/07/05 

Date: Thu, 6 Jan 2005 19:05:04 -0800

OS: WinXP Pro SP2
My PC got a virus Downloader.Trojan, couldn't delete it via Norton
(updated), path is: C:\Windows\System32\04egd.dll. I tried to delete it using
command promt, but got an message "access is denied". How I can delete it?
Please, instruct me as much as in details, I'm not really good using command
promt.