Forums mIRC Help Unable to connect to server (Invalid argument)

I founf something out:

I have Vista
Multiple user accounts
My wife uses Incredimail
When i close incredimail the Invalid argument error is gone and i can connect normaly.

Any ideas on what may cause that?
My wife used Incredimail on my old computer as well and on this machine all worked great untill now.
Hope this info add is usefull.

Greetings