I recently received a virus from who knows where. I have windows XP and I downloaded the AOL security edition and all the securtiy stuff that goes with it. It cleaned up my computer very well but I keep getting the message that it detected an infected file but the file can not be deleted. The file is C:\windows\system\st.3dll. What is this file and why do I need it, and why can it not be deleted. I also get a message saying that "Resource DLL is missing. Please reinstall the application." I have no idea what any of this means. Any help would be greatly aprreciated. Thank you for your time.