554 Transaction Failed 554 5.0.0 Service Unavailable In My Yahoo Mail Account I Keep Getting Messages Bounced Back As "undeliverable" That I Did Not Send. HELP!

In my Yahoo mail account I keep getting messages bounced back as "undeliverable" that I did not send. HELP! - 554 transaction failed 554 5.0.0 service unavailable

For example: (i never sent it)
554 \\ \\ \\ \\ \\ \\ \\ \\ u0026lt; myrickrn@aol.com> ... Service Unavailable
Message / delivery-status
Reporting-MTA: dns; rly-yi03.mx.aol.com
Arrival-Date: Tue, 18 Apr 2006 11:50:44 -0400 (EDT)

Final-Recipient: RFC822; myrickrn@aol.com
Action: Failed
Status: 5.0.0
Remote-MTA: dns; yi03.mail.aol.com air
Diagnostic-Code: SMTP; OPERATIONS 554 N raped - Virus irreparable
Detected. Your e-mail was not sent.
Last attempt-Date: Wed, 18 Apr 2006 20:00:54 -0400 (EDT)
In-text format [Download File | Save to Yahoo! Briefcase]
Date: yahoo.com (68-185-164-68.static.mdsn.wi.charter.co ...
[68.185.164.68]) by rly-yi03.mx.aol.com (V) with ESMTP id
MAILRELAYINYI310-7c244450acfc; Tue, 18 Apr 2006 11:50: 40 -0400
From: dvjduck@yahoo.com
A: myrickrn@aol.com
Subject: Hello
Date: Tue, 18 Apr 2006 10:50:36 -0500
MIME-Version: 1.0
Content-Type: text / plain;
boundary ="----=_ NextPart_000_0007_534B ...