WHAT IS THE ISSUE THAT MY SOFTWARE NOT WORKING
Are you launching AECOsim by double-clicking a DGN file? If so please try opening AECOsim first,then if it opens correctly try creating a new file.
If AECOsim does not open please try a Repair installation and let us know if that resolves the problem.
The 'Abort/Retry/Ignore' dialog normally appears when the application detects a problem that may cause corruption of the active file and is generally a problem with a specific file rather than the whole application.
Regards
Marc