I do not ordinarily send out virus warnings, but this is an exception since I have researched this one and it is a REAL virus. If you receive an email talking about a KLEZ. virus you should delete the message. It is a trap to get you to execute the virus (actually a worm) by trying to get you to think you are preventing an infection. I received such an email and investigated at the site: http://www.f-secure.com/v-descs/klez_h.shtml Go to this link for details. Text of email follows: " Worm Klez.E immunity Body: Klez.E is the most common world-wide spreading worm.It's very dangerous by corrupting your files. Because of its very smart stealth and anti-anti-virus technic,most common AV software can't detect or clean it. We developed this free immunity tool to defeat the malicious virus. You only need to run this tool once,and then Klez will never come into your PC. NOTE: Because this tool acts as a fake Klez to fool the real worm,some AV monitor maybe cry when you run it. If so,Ignore the warning,and select 'continue'. If you have any question,please mail to me."