Found this article in an issue of pca.
Have started to receive the error Rnaapp caused all invalid
page fault in module wininet.dIl at O16f:lO2Olalc’ when I start Outlook Express 6.0. In addition I am receiving notifications that a message I sent could not be delivered to one or more of Its recipients. I don’t understand this as I have never mailed these addresses. Does it make any sense to you?
As we wrote in July’s Helpline. errors involving Rnaapp are often caused by a software conflict. Sometimes a worm or Trojan uses your computer to send out infected messages and this is almost certainly what is happening. The Trojan file was included in the message you attached to your email to us, although as it was quarantined and then removed by our virus scanning gateway we can’t identify it For you. The solution is to get yourself a good up-to-date virus scanner and use it to clean up your system.