We are not suppose to run warnings about virus, worms etc; however, this is my 2nd exception. I have an inbox full of this warning and it will probably get worse tomorrow. Erols, McAffe etc all say it is a hoax and there is an article in the Washington Post today about it. the SULFNBK file is a crucial Windows file - if you have Windows you have it. It helps Windows re-create long file names if they get corrupted. If you leaped before you looked, you can retrieve the deleted file from your Windows CD. There is a virus that can affect the file and others - it is called W32.Magistr.24876@mm. You receive it as an attachment. The "fix" has been available on all the major anti-virus updates since the middle of March. All this information from the Post article - one can only assume they have their facts straight. Martha