Mailer-Daemon

I use Win ME and OE6. For 3 days in a row, I recd a msg from Mailer-Daemon at Yahoo claiming that I had sent an e-mail to a bunch of Yahoo addresses that weren't active or didn't exist. I didn't send anything!

NAV didn't turn up any worms or viruses, but I did dump a couple of small shareware programs that I had downloaded a few days before. Two days have passed without any more messages from Yahoo, but I still don't know what caused it! I'm scrupulously careful about scanning with NAV nd keeping the definitions current. I tried to send a message to Yahoo, with the thought that maybe the problem originated THERE instead of in my computer, but can't seem to find a way to contact Yahoo via e-mail. I belong to several Yahoo groups, so my e-mail addy is available. Oh, forgot to mention. The sender used my e-mail addy, but the name shown was "Miky" and third time and two different first names the other two times. The message was SPAM about mortgage rates. And here's the kicker: at the end of the message it had a *sincere* note about not wanting to SPAM anyone and to "click here" to opt out. Grrr!

Oh! One more thing, that's probably related. Twice I recd a warning that my boot record had changed. There were three choices. The first time, I picked "Ignore and run full scan" and also updated my definitions at NAV. The second time, I picked "Restore boot record" and also ran full scan and updated the definitions again. What's with that?