I have always had the same problem with my copy of FS 2004 ever since it was first released...
weather.dll...
A common problem with FS 2004 according to the many posts about it on the internet...
I just ignore it now.
When I shut down the program, I just wait for the annoying error report to pop up, un-tick the request to restart the program and it all goes away.....

...!
I got fed up with trying to fix it years ago...

...!
...Note: Its got nothing to do with "Weather", (as in wind and rain etc)...

...Its a general Microsoft operating instruction!
Paul...Whether the Weather is Where it should be...or not...